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VULNERABILITIES

CVE-2026-55200 Details

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.

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References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://web.archive.org/web/20260623211210/https://github.com/bikini/exploitarium/tree/main/libssh2-cve-2026-55200-poc CISA-ADPExploitThird Party Advisory
https://github.com/libssh2/libssh2/commit/97acf3dfda80c91c3a8c9f2372546301d4a1a7a8 [email protected]Patch
https://github.com/libssh2/libssh2/pull/2052 [email protected]Patch
https://www.vulncheck.com/advisories/libssh2-out-of-bounds-write-via-unchecked-packet-length-in-transport-c [email protected]Third Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-680Integer Overflow to Buffer Overflow[email protected]

Affected Products

ProductVersions
libssh2 libssh2
1.11.1

CPE

  • cpe:2.3:a:libssh2:libssh2:1.11.1:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

11 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-55200
NVD Published Date:
Jun 17, 2026
NVD Last Modified:
Sep 17, 2026
Source:
[email protected]