CVE catalog

CVE-2025-5987

libssh vulnerabilities

Severity: High · CVSS 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Apr 26, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.73% · Oct 25, 2026

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.

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`	fixed
Debian	libssh	bookworm-security	`0.10.6-0+deb12u3`	fixed
Ubuntu	libssh	noble	`0.10.6-0+deb12u2`	fixed
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	`0.11.2`	fixed
Ubuntu	libssh	24.04	`0.10.5-3ubuntu1`	vulnerable
Ubuntu	libssh	24.04	`0.10.5-3ubuntu2`	vulnerable
Ubuntu	libssh	24.04	`0.10.6-2`	vulnerable
Ubuntu	libssh	24.04	`0.10.6-2build1`	vulnerable
Ubuntu	libssh	24.04	`0.10.6-2build2`	vulnerable
Ubuntu	libssh	24.04	`0.10.6-2ubuntu0.1`	fixed

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	`0.10.6-0+deb12u2`	not yet assigned	Not reported	[1108407]
Ubuntu	libssh	deb	noble	`0.10.6-0+deb12u2`	Not reported	Not reported	Not reported
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
Cpe	libssh	cpe	Not reported	`0.11.2`	Not reported	NVD-CVE-2025-5987	Not reported
Ubuntu	libssh	deb	24.04	`0.10.6-2ubuntu0.1`	Not reported	UBUNTU-CVE-2025-5987	Not reported

[Debian bug #1108407]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libssh-4]Affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
[libssh-dev]Affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
[libssh-doc]Affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · all · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u2 · all · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · all · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · all · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
[libssh-gcrypt-4]Affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
[libssh-gcrypt-dev]Affected
Source package: [libssh]
Details (4)
- 0.10.6-0+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · amd64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12
- 0.10.6-0+deb12u1 · arm64 · bookworm-security
  Affected · Fixed: 0.10.6-0+deb12u2
  usn · libssh · debian · bookworm; usn · libssh · debian · 12

[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, 2:33:47 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)]