CVE-2026-55200
8.3
HIGH
CVSS 3.1
EPSS 0.73%
Description
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.
How to fix CVE-2026-55200
To remediate CVE-2026-55200, upgrade the affected package to a fixed version below.
- —upgrade to 1.11.1-r2 or later
- —upgrade to 1.96.1-r0 or later
Is CVE-2026-55200 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.11.1-r2
- from 0, < 1.96.1-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L |