What is CVE-2025-3757?

CVE-2025-3757 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-2025-3757?

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

Vulnerability in Openpubkey

CVE-2025-3757

Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification.

Published 2025-05-13 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Openpubkey
Opkssh — versions Openpubkey

Weakness classification (CWE)

References

github.com/openpubkey/openpubkey (Product)

Frequently asked questions

What is CVE-2025-3757?: CVE-2025-3757 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-2025-3757?: Critical severity. CVSS v3 base score is 9.8 out of 10.