PT-2026-36550 · Libssh2+2 · Libssh2+2

Dapickle · Published 2026-05-01 · Updated 2026-05-31 · CVE-2026-7598

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions libssh2 versions prior to 1.11.2

Description An integer overflow exists in the userauth password() function within the src/userauth.c file. This issue occurs due to the incorrect handling of the username len and password len arguments during SSH password authentication. A remote attacker can exploit this flaw to potentially cause a denial of service.

Recommendations For versions prior to 1.11.2, apply patch 256d04b60d80bf1190e96b0ad1e91b2174d744b1. As a temporary workaround, restrict the use of the userauth password() function to minimize the risk of exploitation.

Exploit

Fix

Integer Overflow

Weakness Enumeration

CWE-189

CWE-190

Related Identifiers

CVE-2026-7598

ECHO-E686-BEF9-6A8E

OESA-2026-2336

RHSA-2026:16736

RHSA-2026:7021

USN-8309-1

Affected Products

Linuxmint

Ubuntu

Libssh2

References · 27

• 🔥 https://vuldb.com/submit/805564 · Exploit
• https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1 · Patch
• https://github.com/libssh2/libssh2/pull/1858 · Patch
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-7598 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-7598 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-7598 · Security Note
• https://osv.dev/vulnerability/USN-8309-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7598 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-7598 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2336 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-7598 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8309-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-7598 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-7598 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-7598 · Vendor Advisory