PT-2026-53083 · Undefined · Undefined

Published 2026-06-28 · Updated 2026-06-28 · CVE-2026-58051

NVD

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

libssh2 through 1.11.1 grows its publickey list with SSH2 REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2 publickey list free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

Exploit

Fix

Use of Uninitialized Resource

Weakness Enumeration

CWE-908

Related Identifiers

CVE-2026-58051

Affected Products

Undefined

References · 4

• 🔥 https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58051 · Security Note
• https://github.com/libssh2/libssh2/blob/master/src/publickey.c · Note
• https://vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup · Note