CVE catalog

CVE-2026-59851

A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, al

[CVE catalog]

Severity: High · CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: Jul 20, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.49% · Oct 25, 2026

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`	not affected
Debian	libssh	trixie-security	`0.11.5-0+deb13u1`	not affected
Debian	libssh	bookworm	`0.10.6-0+deb12u2`	not affected
Debian	libssh	bookworm-security	`0.10.6-0+deb12u3`	not affected
Cpe	libssh	Not reported	Not reported	not affected
Cpe	libssh	Not reported	Not reported	unknown
Cpe	hardened_images	Not reported	Not reported	unknown
Cpe	enterprise_linux	Not reported	Not reported	unknown

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libssh	source	sid	`0.12.1-1`	not yet assigned	Not reported	[1142537]
Debian	libssh	source	forky	`0.12.1-1`	not yet assigned	Not reported	[1142537]
Debian	libssh	source	trixie	`Not affected`	unimportant	Not reported	[1142537]
Debian	libssh	source	bookworm	`Not affected`	unimportant	Not reported	[1142537]

[Debian bug #1142537]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

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

Observed: Oct 27, 2026, 7:12:48 AM 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]