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Vulnerabilities

Vulnerability · 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 May 13, 2025 · catalog updated May 13, 2025 · OPKSSH OPKSSH

Check if you run it

No confirmed exploitation is on record for CVE-2025-3757. EPSS is 0.43%. Act only if a listed version of OPKSSH OPKSSH is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Vendor / distro source
Affected products
vendor OPKSSH OPKSSH Openpubkey ≤0.9.0

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor OPKSSH OPKSSH Openpubkey ≤0.9.0Openpubkey ≤0.9.0

How to fix CVE-2025-3757

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-3757. EPSS is 0.43%. Act only if a listed version of OPKSSH OPKSSH is installed.

Which versions are affected?

Compare what you have installed with OPKSSH OPKSSH Openpubkey ≤0.9.0 Openpubkey ≤0.9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 13, 2025 · EUVD

    Detected

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

  2. May 13, 2025 · EUVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2025-3757

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-3757

    30-day exploitation probability 0.4%

    first.org
  • EUVDVulnerability recordEUVD-2025-14478

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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.