curl - Debian Package Tracker

general

source: curl (main)
version: 8.20.0-2
maintainer: Debian Curl Maintainers (DMD)
uploaders: Sergio Durigan Junior [DMD] – Samuel Henrique [DMD] – Carlos Henrique Lima Melara [DMD]
arch: all any
std-ver: 4.7.4
VCS: Git (Browse, QA)

versions [more versions can be listed by madison] [old versions available from snapshot.debian.org]

[pool directory]

o-o-stable: 7.74.0-1.3+deb11u13
o-o-sec: 7.74.0-1.3+deb11u16
o-o-p-u: 7.74.0-1.3+deb11u13
oldstable: 7.88.1-10+deb12u14
old-sec: 7.88.1-10+deb12u5
old-bpo: 8.14.1-2+deb13u2~bpo13+1
stable: 8.14.1-2+deb13u3
stable-bpo: 8.19.0-1~bpo13+1
testing: 8.20.0-2
unstable: 8.20.0-2
exp: 8.20.0-2+exp1

versioned links

7.74.0-1.3+deb11u13: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
7.74.0-1.3+deb11u16: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
7.88.1-10+deb12u5: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
7.88.1-10+deb12u14: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
8.14.1-2+deb13u2~bpo13+1: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
8.14.1-2+deb13u3: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
8.19.0-1~bpo13+1: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
8.20.0-2: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
8.20.0-2+exp1: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]

binaries

curl (31 bugs: 0, 21, 10, 0)
libcurl3t64-gnutls
libcurl4-doc
libcurl4-gnutls-dev
libcurl4-openssl-dev (4 bugs: 0, 4, 0, 0)
libcurl4t64

action needed

The VCS repository is not up to date, push the missing commits. high

vcswatch reports that the current version of the package is not in its VCS.
Either you need to push your commits and/or your tags, or the information about the package's VCS are out of date. A common cause of the latter issue when using the Git VCS is not specifying the correct branch when the packaging is not in the default one (remote HEAD branch), which is usually "master" but can be modified in salsa.debian.org in the project's general settings with the "Default Branch" field). Alternatively the Vcs-Git field in debian/control can contain a "-b <branch-name>" suffix to indicate what branch is used for the Debian packaging.

Created: 2026-05-23 Last update: 2026-05-23 10:02

9 bugs tagged patch in the BTS normal

The BTS contains patches fixing 9 bugs (10 if counting merged bugs), consider including or untagging them.

Created: 2026-04-06 Last update: 2026-05-23 14:00

lintian reports 1 warning normal

Lintian reports 1 warning about this package. You should make the package lintian clean getting rid of them.

Created: 2026-05-13 Last update: 2026-05-13 21:30

1 open merge request in Salsa normal

There is 1 open merge request for this package on Salsa. You should consider reviewing and/or merging these merge requests.

Created: 2026-05-13 Last update: 2026-05-13 12:03

6 low-priority security issues in trixie low

There are 6 open security issues in trixie.

6 issues left for the package maintainer to handle:

CVE-2026-3783: (needs triaging) When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.
CVE-2026-3784: (needs triaging) curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.
CVE-2026-5773: (needs triaging) libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
CVE-2026-7168: (needs triaging) Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.
CVE-2025-14524: (needs triaging) When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a cross-protocol redirect to a second URL that uses an IMAP, LDAP, POP3 or SMTP scheme, curl might wrongly pass on the bearer token to the new target host.
CVE-2025-14819: (needs triaging) When doing TLS related transfers with reused easy or multi handles and altering the `CURLSSLOPT_NO_PARTIALCHAIN` option, libcurl could accidentally reuse a CA store cached in memory for which the partial chain option was reversed. Contrary to the user's wishes and expectations. This could make libcurl find and accept a trust chain that it otherwise would not.

You can find information about how to handle these issues in the security team's documentation.

7 issues that should be fixed with the next stable update:

CVE-2026-1965: libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it just sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the curl_multi API).
CVE-2026-3805: When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.
CVE-2026-4873: A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.
CVE-2026-5545: libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. An application that first uses Negotiate authentication to a server with `user1:password1` and then does another operation to the same server asking for any authentication method but for `user2:password2` (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...
CVE-2026-6253: curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy
CVE-2026-6276: Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.
CVE-2026-6429: When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.

Created: 2026-01-07 Last update: 2026-05-22 05:00

6 low-priority security issues in bookworm low

There are 6 open security issues in bookworm.

6 issues left for the package maintainer to handle:

CVE-2026-1965: (needs triaging) libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it just sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the curl_multi API).
CVE-2026-4873: (needs triaging) A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.
CVE-2026-5545: (needs triaging) libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. An application that first uses Negotiate authentication to a server with `user1:password1` and then does another operation to the same server asking for any authentication method but for `user2:password2` (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...
CVE-2026-6253: (needs triaging) curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy
CVE-2026-6276: (needs triaging) Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.
CVE-2026-6429: (needs triaging) When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.

You can find information about how to handle these issues in the security team's documentation.

7 issues that should be fixed with the next stable update:

CVE-2026-3783: When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.
CVE-2026-3784: curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.
CVE-2026-5773: libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
CVE-2026-7168: Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.
CVE-2025-10148: curl's websocket code did not update the 32 bit mask pattern for each new outgoing frame as the specification says. Instead it used a fixed mask that persisted and was used throughout the entire connection. A predictable mask pattern allows for a malicious server to induce traffic between the two communicating parties that could be interpreted by an involved proxy (configured or transparent) as genuine, real, HTTP traffic with content and thereby poison its cache. That cached poisoned content could then be served to all users of that proxy.
CVE-2025-14524: When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a cross-protocol redirect to a second URL that uses an IMAP, LDAP, POP3 or SMTP scheme, curl might wrongly pass on the bearer token to the new target host.
CVE-2025-14819: When doing TLS related transfers with reused easy or multi handles and altering the `CURLSSLOPT_NO_PARTIALCHAIN` option, libcurl could accidentally reuse a CA store cached in memory for which the partial chain option was reversed. Contrary to the user's wishes and expectations. This could make libcurl find and accept a trust chain that it otherwise would not.

Created: 2025-09-10 Last update: 2026-05-22 05:00

debian/patches: 1 patch to forward upstream low

Among the 4 debian patches available in version 8.20.0-2 of the package, we noticed the following issues:

1 patch where the metadata indicates that the patch has not yet been forwarded upstream. You should either forward the patch upstream or update the metadata to document its real status.

Created: 2023-02-26 Last update: 2026-05-13 20:02

testing migrations

This package will soon be part of the auto-openssl transition. You might want to ensure that your package is ready for it. You can probably find supplementary information in the debian-release archives or in the corresponding release.debian.org bug.

news

[rss feed]

[2026-05-23] Accepted curl 8.20.0-2+exp1 (source) into experimental (Carlos Henrique Lima Melara)
[2026-05-22] curl 8.20.0-2 MIGRATED to testing (Debian testing watch)
[2026-05-13] Accepted curl 8.20.0-2 (source) into unstable (Carlos Henrique Lima Melara)
[2026-05-11] curl 8.20.0-1 MIGRATED to testing (Debian testing watch)
[2026-05-02] Accepted curl 8.14.1-2+deb13u3 (source) into proposed-updates (Debian FTP Masters) (signed by: Samuel Henrique)
[2026-04-30] Accepted curl 8.20.0-1+exp (source) into experimental (Samuel Henrique)
[2026-04-29] Accepted curl 8.20.0-1 (source) into unstable (Samuel Henrique)
[2026-04-23] Accepted curl 8.20.0~rc3-1 (source) into unstable (Samuel Henrique)
[2026-04-23] Accepted curl 8.20.0~rc3-1+exp1 (source) into experimental (Samuel Henrique)
[2026-04-15] Accepted curl 8.20.0~rc2-1+exp1 (source) into experimental (Carlos Henrique Lima Melara)
[2026-04-15] Accepted curl 8.20.0~rc2-1 (source) into unstable (Carlos Henrique Lima Melara)
[2026-04-08] Accepted curl 8.20.0~rc1-1+exp3 (source) into experimental (Carlos Henrique Lima Melara)
[2026-04-07] Accepted curl 8.20.0~rc1-1+exp2 (source) into experimental (Samuel Henrique)
[2026-04-04] Accepted curl 8.20.0~rc1-1+exp1 (source) into experimental (Samuel Henrique)
[2026-04-03] curl 8.19.0-3 MIGRATED to testing (Debian testing watch)
[2026-03-27] Accepted curl 8.19.0-3+exp2 (source) into experimental (Samuel Henrique)
[2026-03-27] Accepted curl 8.19.0-3+exp1 (source) into experimental (Samuel Henrique)
[2026-03-27] Accepted curl 8.19.0-3 (source) into unstable (Carlos Henrique Lima Melara)
[2026-03-27] Accepted curl 8.19.0-2 (source) into unstable (Carlos Henrique Lima Melara)
[2026-03-26] Accepted curl 8.19.0-1+exp1 (source) into experimental (Samuel Henrique)
[2026-03-18] Accepted curl 8.19.0-1~bpo13+1 (source) into stable-backports (Samuel Henrique)
[2026-03-18] curl 8.19.0-1 MIGRATED to testing (Debian testing watch)
[2026-03-12] Accepted curl 8.19.0-1 (source) into unstable (Carlos Henrique Lima Melara)
[2026-02-28] Accepted curl 8.19.0~rc3-1 (source) into unstable (Carlos Henrique Lima Melara)
[2026-02-24] Accepted curl 8.19.0~rc2-2 (source) into unstable (Carlos Henrique Lima Melara)
[2026-02-21] Accepted curl 8.19.0~rc2-1 (source) into unstable (Samuel Henrique)
[2026-02-15] Accepted curl 8.19.0~rc1-1~exp1 (source) into experimental (Samuel Henrique)
[2026-01-19] curl 8.18.0-2 MIGRATED to testing (Debian testing watch)
[2026-01-15] Accepted curl 8.18.0-2 (source) into unstable (Carlos Henrique Lima Melara)
[2026-01-14] Accepted curl 8.14.1-2+deb13u2~bpo13+1 (source) into oldstable-backports (Samuel Henrique)

bugs [bug history graph]

all: 48 52
RC: 0
I&N: 37 39
M&W: 10 12
F&P: 1
patch: 9 10

links

homepage
lintian (0, 1)
buildd: logs, exp, reproducibility, cross
popcon
browse source code
other distros
security tracker
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ubuntu

[Information about Ubuntu for Debian Developers]

version: 8.18.0-1ubuntu2
82 bugs (3 patches)