CVE-2025-5351: libssh Double Free
Vulnerability summary
CVE-2025-5351 is a medium (CVSS 6.5) Double Free vulnerability in libssh. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 6 · Related 4Timeline
- 04-07-2025PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.61%
Chance of exploitation in the next 30 days
Percentile
48%
Versus all other CVEs
30-day change
+0.09 pp
From 0.53% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat2 products
- enterprise_linuxEOL6.0 | 7.0 | 8.0 | 9.0 | 10.0
- openshift_container_platform4.0
Debian1 product
- libssh< 0.10.6-0+deb12u2 | < 0.11.2-1
Libssh1 product
- libssh≥ 0.10.0, < 0.11.2
Ubuntu1 product
- libssh< 0.10.6-2ubuntu0.1
4 vendors · 5 products
