Nixpkgs security tracker

Untriaged

Permalink CVE-2026-59842

3.7 LOW

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

created 1 month, 1 week ago Activity log

Created suggestion 1 month, 1 week ago

Libssh: libssh: information disclosure via short gssapi curve25519 public key

A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.

References

https://access.redhat.com/security/cve/CVE-2026-59842 vdb-entryx_refsource_REDHAT
RHBZ#2498168 issue-trackingx_refsource_REDHAT

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