Nixpkgs security tracker

Untriaged

Permalink CVE-2026-59845

5.3 MEDIUM

CVSS version (CVSS): 3.1
Attack Vector (AV): Local (L)
Attack Complexity (AC): High (H)
Privileges Required (PR): Low (L)
User Interaction (UI): Required (R)
Scope (S): Changed (C)
Confidentiality (C): None (N)
Integrity (I): None (N)
Availability (A): High (H)
Modified Attack Vector (MAV): Local (L)
Modified Attack Complexity (MAC): High (H)
Modified Privileges Required (MPR): Low (L)
Modified User Interaction (MUI): Required (R)
Modified Confidentiality (MC): None (N)
Modified Scope (MS): Changed (C)
Modified Integrity (MI): None (N)
Modified Availability (MA): High (H)

created 1 month, 1 week ago Activity log

Created suggestion 1 month, 1 week ago

Libssh: libssh: denial of service via unchecked proxycommand fork() failure

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

References

https://access.redhat.com/security/cve/CVE-2026-59845 vdb-entryx_refsource_REDHAT
RHBZ#2498178 x_refsource_REDHATissue-tracking

Affected products

libssh

Matching in nixpkgs

pkgs.libssh

SSH client library

nixos-unstable 0.12.0
- nixpkgs-unstable 0.12.0
- nixos-unstable-small 0.12.0
nixos-26.05 0.12.0
- nixos-26.05-small 0.12.0
- nixpkgs-26.05-darwin 0.12.0

pkgs.libssh2

Client-side C library implementing the SSH2 protocol

nixos-unstable 1.11.1
- nixpkgs-unstable 1.11.1
- nixos-unstable-small 1.11.1
nixos-26.05 1.11.1
- nixos-26.05-small 1.11.1
- nixpkgs-26.05-darwin 1.11.1

pkgs.libsshWithGssapi

SSH client library

nixos-unstable -
- nixos-unstable-small 0.12.0

pkgs.haskellPackages.libssh

libssh bindings

nixos-unstable 0.1.0.0
- nixpkgs-unstable 0.1.0.0
- nixos-unstable-small 0.1.0.0
nixos-26.05 0.1.0.0
- nixos-26.05-small 0.1.0.0
- nixpkgs-26.05-darwin 0.1.0.0