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

Q: How do I fix CVE-2025-4658?

openpubkey: upgrade to 0.10.0; opkssh: upgrade to 0.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-4658 being exploited?

CVE-2025-4658 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-2025-4658 affect?

CVE-2025-4658 affects openpubkey, opkssh. 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. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in OpenP

Q: How urgent is CVE-2025-4658?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2025-4658 is a critical-severity flaw (CVSS 9.8) affecting openpubkey, opkssh. 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. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in OpenPubkey also applies to OPKSSH versions prior to 0.5.0 and would allow an attacker to bypass OPKSSH authentication.

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	0.3% (top 73%)
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 09:33 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.

openpubkey opkssh UPGRADE

Affected: < 0.5.0

Fixed in: 0.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.5.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opkssh

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-2025-4658?

openpubkey: upgrade to 0.10.0; opkssh: upgrade to 0.5.0. Exact commands for each OS are on this page.

Is CVE-2025-4658 being exploited?

CVE-2025-4658 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-2025-4658 affect?

CVE-2025-4658 affects openpubkey, opkssh. 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. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in OpenP

How urgent is CVE-2025-4658?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-3757 CRITICAL 9.8 UPGRADE Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted

References

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