Nixpkgs security tracker

Untriaged

Permalink CVE-2026-59844

6.5 MEDIUM

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

A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.

References

https://access.redhat.com/security/cve/CVE-2026-59844 vdb-entryx_refsource_REDHAT
RHBZ#2498177 issue-trackingx_refsource_REDHAT

Affected products

libssh

libssh2

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