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CVE-2026-55200

9.2 critical exploit ×3 SSVC exploitation: poc Modified
NVD · CVE.org

libssh2 1.11.1, fixed in commit 97acf3d, contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.

Fix

Public exploits 3

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.2 · libssh2NVD modified 2026-10-22 19:17

Affected (CPE criteria) 1

  • cpe:2.3:a:libssh2:libssh2:1.11.1:*:*:*:*:*:*:*

References 4