CVE-2025-4658
CVE-2025-4658 is a critical-severity vulnerability in Openpubkey with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v4: 9.3
- EPSS exploit prediction: 0% (21st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-14477
- Weakness: CWE-347
- Affected product: Openpubkey
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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 OpenPubkey also applies to OPKSSH versions prior to 0.5.0 and would allow an attacker to bypass OPKSSH authentication.
- How severe is CVE-2025-4658?
- CVE-2025-4658 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-4658 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-4658?
- CVE-2025-4658 primarily affects Openpubkey. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2025-4658?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-4658 have an EU (EUVD) identifier?
- Yes. CVE-2025-4658 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14477.
- When was CVE-2025-4658 published?
- CVE-2025-4658 was published on 2025-05-13 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:a:openpubkey:openpubkey:*:*:*:*:*:*:*:*
- cpe:2.3:a:openpubkey:opkssh:*:*:*:*:*:*:*:*
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