CVE-2026-58051

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

6.5 / 10

Vector String

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

Vulnerability Description

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

Vulnerability Details

Published Date

June 28, 2026

Last Modified

June 28, 2026

CWE ID

CWE-908

Source

NVD

Vendor

libssh2

Product

libssh2

External References

https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc
https://github.com/libssh2/libssh2/blob/master/src/publickey.c
https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup

CVE-2026-58051

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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