Log in Start free

Vulnerability · Published May 1, 2026 · Assigned by VulDB

CVE-2026-7598libssh2 userauth.c userauth_password integer overflow

High 7.3

In plain English

A high-severity integer overflow in libssh2. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.5%top 59.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20libssh21.11.0-r3ALPINE-CVE-2026-7598
Alpine:v3.21libssh21.11.1-r1ALPINE-CVE-2026-7598
Alpine:v3.22libssh21.11.1-r1ALPINE-CVE-2026-7598
Alpine:v3.23libssh21.11.1-r2ALPINE-CVE-2026-7598
Alpine:v3.24libssh21.11.1-r2ALPINE-CVE-2026-7598
Debian:12libssh21.10.0-3+deb12u1DEBIAN-CVE-2026-7598
Debian:13libssh21.11.1-1+deb13u1DEBIAN-CVE-2026-7598
Debian:14libssh21.11.1-3DEBIAN-CVE-2026-7598
Ubuntu:22.04:LTSlibssh2no fix listedUBUNTU-CVE-2026-7598
Ubuntu:24.04:LTSlibssh21.11.0-4.1ubuntu0.24.04.1UBUNTU-CVE-2026-7598
Ubuntu:25.10libssh21.11.1-1ubuntu0.25.10.1UBUNTU-CVE-2026-7598
Ubuntu:26.04:LTSlibssh21.11.1-1ubuntu0.26.04.1UBUNTU-CVE-2026-7598

Affected products (as reported)

VendorProductVersions
n/a libssh2 1.11.01.11.1

Weakness: CWE-190, CWE-189 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

References