VULNERABILITY INTELLIGENCE

CVE-2026-55200

CVSS score8.1 HIGH
EPSS probability3.88%
CISA KEVNot currently listed
Published2026-06-17
Last modified2026-10-22
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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.

Weakness classification

  • disclosure@vulncheck.com: CWE-680

Primary references