CVE-2025-8277

NameCVE-2025-8277
DescriptionA flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1114859

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libssh (PTS)bullseye (security), bullseye0.9.8-0+deb11u1vulnerable
bookworm (security), bookworm0.10.6-0+deb12u1vulnerable
trixie0.11.2-1vulnerable
forky, sid0.11.3-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libsshsource(unstable)0.11.3-11114859

Notes

[trixie] - libssh <no-dsa> (Minor issue)
[bookworm] - libssh <no-dsa> (Minor issue)
[bullseye] - libssh <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2383888
https://www.libssh.org/security/advisories/CVE-2025-8277.txt
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