Is CVE-2026-3731 actively exploited?

No active exploitation of CVE-2026-3731 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3731 be exploited remotely?

Yes. CVE-2026-3731 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-3731?

CVE-2026-3731 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-3731

HIGH

CVE-2026-3731

CWE-119Published: March 8, 2026· Updated: Mar 12, 2026

7.5

CVSS v3.1

EPSS:0.08%probability of exploitation in 30 daysPercentile:22.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-3731 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.