What is CVE-2025-4658?

CVE-2025-4658 is a critical-severity vulnerability in Openpubkey, classified under Authentication Bypass by Primary Weakness. CVSS score: 9.8/10. Published 2025-05-13.

How severe is CVE-2025-4658?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Openpubkey

CVE-2025-4658

Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in Open…

EPSS: 0.003 (21.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Openpubkey
Openpubkey Opkssh
Opkssh — versions 0.1.0

Weakness classification (CWE)

CWE-305 — Authentication Bypass by Primary Weakness
CWE-347 — Improper Verification of Cryptographic Signature

References

cna@cloudflare.com (Product)

Frequently asked questions

What is CVE-2025-4658?: CVE-2025-4658 is a critical-severity vulnerability in Openpubkey, classified under Authentication Bypass by Primary Weakness. CVSS score: 9.8/10. Published 2025-05-13.
How severe is CVE-2025-4658?: Critical severity. CVSS v3 base score is 9.8 out of 10.