CVE-2026-3731

Name: CVE-2026-3731
Creator: NVD / NIST
Published: 2026-03-08T11:15:50.307+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 0.63%

Last modified Jun 17, 2026

CVE-2026-3731 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.63%

45.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libssh	Libssh	<= 0.11.3

References

https://gitlab.com/libssh/libssh-mirror/-/commit/855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60Patch
https://vuldb.com/?ctiid.349709Permissions Required, VDB Entry
https://vuldb.com/?id.349709Third Party Advisory, VDB Entry
https://vuldb.com/?submit.767120Third Party Advisory, VDB Entry
https://www.libssh.org/files/0.12/libssh-0.12.0.tar.xzPatch, Third Party Advisory
https://www.libssh.org/security/advisories/libssh-2026-sftp-extensions.txtProduct

Timeline

Published: Mar 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3731?

How severe is CVE-2026-3731?

CVE-2026-3731 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3731?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3731?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST