CVE-2026-55200

HIGH SEVERITY

CVSS Score & Metrics

Base Score

8.1 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

June 17, 2026

Last Modified

June 18, 2026

CWE ID

CWE-680

Source

NVD

Vendor

libssh2

Product

libssh2

External References

https://github.com/libssh2/libssh2/commit/97acf3dfda80c91c3a8c9f2372546301d4a1a7a8
https://github.com/libssh2/libssh2/pull/2052
https://www.vulncheck.com/advisories/libssh2-out-of-bounds-write-via-unchecked-packet-length-in-transport-c

CVE-2026-55200

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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