Dashboard / CVE-2026-55200

CVE-2026-55200

CRITICAL
INFO Priority: 0.36 BB Relevance: 79/100
Published: 2026-06-17 Modified: 2026-10-22 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: Present
VC: High
VI: High
VA: High

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 (1)

Affected Software (1)

VendorProductVersion
libssh2 libssh2 1.11.1

References & Advisories (4)

Bug Bounty Relevance

79 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.2 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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

EPSS — Exploitation Probability

3.88%
Raw Score 0.038770
Percentile 90.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.03877
2026-10-28
0.03877

Intelligence Sources

nvd ref →

External Links