CVE-2025-3757: Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted

Q: How do I fix CVE-2025-3757?

openpubkey: upgrade to 0.10.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-3757 being exploited?

CVE-2025-3757 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-3757 affect?

CVE-2025-3757 affects openpubkey. Severity is critical (CVSS 9.8). Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification.

Q: How urgent is CVE-2025-3757?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-3757 is a critical-severity flaw (CVSS 9.8) affecting openpubkey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-305, CWE-347
Published	2025-05-13
Last modified	2026-06-17

Publisher (CNA): Cloudflare, Inc. · Vendor: openpubkey

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-13 17:16 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

openpubkey openpubkey UPGRADE

Affected: < 0.10.0

Fixed in: 0.10.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openpubkey || rpm -q openpubkey || openpubkey --version

2. UPGRADE to 0.10.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openpubkey

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openpubkey

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-3757?

openpubkey: upgrade to 0.10.0. Exact commands for each OS are on this page.

Is CVE-2025-3757 being exploited?

CVE-2025-3757 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-3757 affect?

CVE-2025-3757 affects openpubkey. Severity is critical (CVSS 9.8). Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification.

How urgent is CVE-2025-3757?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-4658 CRITICAL 9.8 UPGRADE UPGRADE Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted

References

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