CVE-2026-55200

HighCVSS 8.3/10Last modified Oct 22, 2026

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.

Metrics

CVSS 3.1 8.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Weakness enumeration

CWE-680

Affected software

No affected versions have been published.

Timeline

Published: Jun 17, 2026
Last modified: Oct 22, 2026
NVD status: Modified

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