CVE-2025-5351

Name	CVE-2025-5351
Description	A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1108407

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libssh (PTS)	bullseye (security), bullseye	0.9.8-0+deb11u1	vulnerable
	bookworm, bookworm (security)	0.10.6-0+deb12u1	vulnerable
	sid, trixie	0.11.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libssh	source	(unstable)	0.11.2-1			1108407

Notes

[bookworm] - libssh <no-dsa> (Minor issue)
[bullseye] - libssh <postponed> (Minor issue)
https://www.libssh.org/security/advisories/CVE-2025-5351.txt
Fixed by: https://git.libssh.org/projects/libssh.git/commit/?id=6ddb730a27338983851248af59b128b995aad256 (libssh-0.11.2)