Medium 5.3Published Mar 8, 2026

CVE-2026-3731libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds

Updated under an hour ago (Oct 26, 2026, 6:00 PM ET)

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It affects n/a libssh. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.

CVSS: 5.3 MEDIUM (v3.1, CNA)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
Weakness (CWE): CWE-125, CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Analyzed
Record last updated: Mar 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

n/a libssh libssh:libssh	0.11.0; 0.11.1; 0.11.2; 0.11.3; 0.11.4 not affected; 0.12.0 not affected	CNA record
libssh libssh libssh:libssh	through 0.11.3	NVD

References

References

https://vuldb.com/?id.349709	vdb-entry, technical-description, third-party-advisory
https://vuldb.com/?ctiid.349709	signature, permissions-required, vdb-entry
https://vuldb.com/?submit.767120	third-party-advisory, vdb-entry
https://www.libssh.org/security/advisories/libssh-2026-sftp-extensions.txt	related, product
https://gitlab.com/libssh/libssh-mirror/-/commit/855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60	patch
https://www.libssh.org/files/0.12/libssh-0.12.0.tar.xz	patch, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.