CVE-2026-42154:
Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.
Among the 30 debian patches
available in version 3.5.3+ds1-5 of the package,
we noticed the following issues:
8 patches
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.
Migration status for prometheus (3.5.3+ds1-3 to 3.5.3+ds1-5): Waiting for test results or another package, or too young (no action required now - check later)
![[bug history graph]](https://qa.debian.org/data/bts/graphs/p/prometheus.png){kind=link}