There are 3 open security issues in bookworm.
2 important issues:
- CVE-2026-95507:
- CVE-2026-95508:
A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.
1 issue postponed or untriaged:
- CVE-2026-9539:
(postponed; to be fixed through a stable update)
An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).
![[bug history graph]](https://qa.debian.org/data/bts/graphs/libs/libslirp.png){kind=link}