CVE catalog

CVE-2025-5449

libssh vulnerabilities

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Jun 24, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.96% · Oct 25, 2026

A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libssh	sid	`0.12.2-1`	fixed
Debian	libssh	forky	`0.12.2-1`	fixed
Debian	libssh	trixie	`0.11.5-0+deb13u1`	fixed
Debian	libssh	trixie-security	`0.11.5-0+deb13u1`	fixed
Debian	libssh	bookworm	`0.10.6-0+deb12u2`	not affected
Debian	libssh	bookworm-security	`0.10.6-0+deb12u3`	not affected
Ubuntu	libssh	noble	Not reported	not affected
Ubuntu	libssh	noble	`0.10.6-2ubuntu0.1`	fixed
Ubuntu	libssh-4	noble	`0.10.6-2ubuntu0.1`	fixed
Ubuntu	libssh-dev	noble	`0.10.6-2ubuntu0.1`	fixed
Ubuntu	libssh-doc	noble	`0.10.6-2ubuntu0.1`	fixed
Ubuntu	libssh-gcrypt-4	noble	`0.10.6-2ubuntu0.1`	fixed
Ubuntu	libssh-gcrypt-dev	noble	`0.10.6-2ubuntu0.1`	fixed
Cpe	libssh	Not reported	Not reported	unknown

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libssh	source	sid	`0.11.2-1`	not yet assigned	Not reported	[1108407]
Debian	libssh	source	forky	`0.11.2-1`	not yet assigned	Not reported	[1108407]
Debian	libssh	source	trixie	`0.11.2-1`	not yet assigned	Not reported	[1108407]
Debian	libssh	source	bookworm	`Not affected`	unimportant	Not reported	[1108407]
Ubuntu	libssh	deb	noble	`0.10.6-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libssh-4	deb	noble	`0.10.6-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libssh-dev	deb	noble	`0.10.6-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libssh-doc	deb	noble	`0.10.6-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libssh-gcrypt-4	deb	noble	`0.10.6-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libssh-gcrypt-dev	deb	noble	`0.10.6-2ubuntu0.1`	Not reported	Not reported	Not reported

[Debian bug #1108407]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libssh-4]Not affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
[libssh-dev]Not affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
[libssh-doc]Not affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · all · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u2 · all · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · all · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · all · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
[libssh-gcrypt-4]Not affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
[libssh-gcrypt-dev]Not affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Not affected
  usn · libssh · debian · bookworm

[Debian 13 (Trixie)]

[libssh-4]Fixed
Source package: [libssh]
Details (4)
- 0.11.2-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.2-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.5-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.5-0+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
[libssh-dev]Fixed
Source package: [libssh]
Details (4)
- 0.11.2-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.2-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.5-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.5-0+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
[libssh-doc]Fixed
Source package: [libssh]
Details (4)
- 0.11.2-1+deb13u1 · all · trixie
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.2-1+deb13u1 · all · trixie
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.5-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13
- 0.11.5-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 0.11.2-1
  usn · libssh · debian · 13

Observed: Oct 27, 2026, 1:32:31 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]