CVE-2025-5351 MEDIUM

CVE-2025-5351: Libssh: double free vulnerability in libssh key export functions

Vendor Libssh
Product libssh
Weakness CWE-415
Published July 4, 2025
Last update May 19, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed.

Key dates

02Disclosure timeline

July 4, 2025 CVE published
May 19, 2026 Record updated