How serious is CVE-2026-3731?

This vulnerability has a CVSS score of 6.9 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-3731?

Yes, proof-of-concept exploit code for CVE-2026-3731 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-3731?

CVE-2026-3731 affects libssh libssh. Check the full CVE details for specific version information.

How do I fix CVE-2026-3731?

To remediate CVE-2026-3731, check for security patches from libssh. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-3731

Medium

|6.9

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

An attacker can exploit a flaw in the libssh library to read sensitive data from memory by manipulating specific input parameters, which can be done remotely. To protect against this risk, it's essential to upgrade to the latest versions of the library.

Technical 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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

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

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$1,000($500-$1K)

Vendor Response

Grade APatched in 4 days

Quick Information

Published

Mar 8, 2026

about 1 month ago

Last Modified

Mar 12, 2026

26 days ago

Vendor

libssh

Product

libssh