CVE-2026-55200: libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c

Overview

Severity

High (CVSS 8.1)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-06-27

Last Updated

2026-06-28

EPSS Score

0.92% (percentile: 55.8%)

Detection & Weaponization (1 sources)

Maturity: Exploit

• GitHub PoC: 1 repositories

Affected Products (4)

Other

• 21485-17084
• 21431-17084
• 21318-17084
• 20881-17084

Revision History

• 2026-06-27: Information published.
• 2026-06-28: Information published.