Out-of-bounds Read in Libssh
CVE-2026-3731
A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of…
Vulnerability class: Buffer Overflow
EPSS: 0.000 (13.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C.
Affected products
- N/a Libssh — versions 0.11.0, 0.11.1, 0.11.2
Weakness classification (CWE)
References
- VDB-349709 | libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds (vdb-entry, technical-description)
- VDB-349709 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #767120 | libssh.org libssh libssh < 0.11.4; < 0.12.0 Out-of-Bounds Read (third-party-advisory)
- www.libssh.org/security/advisories/libssh-2026-sftp-extensions.txt (related)
- gitlab.com/libssh/libssh-mirror/-/commit/855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b… (patch)
- www.libssh.org/files/0.12/libssh-0.12.0.tar.xz (patch)
Frequently asked questions
- What is CVE-2026-3731?
- CVE-2026-3731 is a medium-severity vulnerability in Libssh, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-03-08.
- How severe is CVE-2026-3731?
- Medium severity. CVSS v3 base score is 5.3 out of 10.