CVE-2026-55200: exploitation status and patch state

CVE-2026-55200 · CVSS 8.1 HIGH · EPSS 2% · patch available

libssh2 through 1.11.1, fixed in commit 7acf3df 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.

Is CVE-2026-55200 exploited?

• Not in the CISA KEV catalog.
• EPSS puts exploitation in the next 30 days at 2%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

• CBL-Mariner Releases

What PlainSec published about CVE-2026-55200

• AI Fuzzing Turns One Dump Into Mass PoCs (2026-07-03)

Primary sources

• NVD record

What this record does not say

• No affected package data.

KEV and EPSS are re-checked daily. Record last updated 2026-08-12.