CVE-2026-55200: libssh2 1.11.1

CVE-2026-55200. CVSS 3.1 base score 8.3 (HIGH, NVD). EPSS 0.04024 (percentile 0.90532), scored 21-Oct-2026.

Affected technology

libssh2 · 1.11.1
libssh2

libssh2 · 1.11.1, 1c3f1b7da588f2652260285529ec3c1f1125eb4e to before 97acf3dfda80c91c3a8c9f2372546301d4a1a7a8
libssh2

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution. Vendor/CNA’s CVSS 4.0 assessment (base score 9.2/10) rates confidentiality, integrity and availability impact as high.

Published 22-Oct-2026 20:55 UTC

CWE: CWE-680
CCR priority: 34.2 /100 (P4)
CVSS 3.1: 8.3 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L · NVD
EPSS: 0.04024 · percentile 0.90532 · 2026-10-21
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-22 20:50:20.011821+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-55200.html