CVE-2026-3731 is an out-of-bounds read vulnerability in libssh versions up to 0.11.3, specifically within the SFTP Extension Name Handler component. A remote attacker can trigger this flaw by manipulating the idx argument in the sftp_extensions_get_name/sftp_extensions_get_data functions. Rated with a CVSS score of 5.3 (MEDIUM), this vulnerability has a low attack complexity and requires no user interaction or privileges, potentially leading to a denial of service. There is currently no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE. Users are advised to upgrade to libssh version 0.11.4 or 0.12.0 to remediate this issue.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 0.11.3CPE matchmatch criteria | cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.