# CVE-2025-4658: Authentication Bypass in OPKSSH

> CVE-2025-4658: Authentication Bypass in OPKSSH. CVSS 9.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-4658
Last updated: 2026-06-17T09:33:43Z

- Published: 2025-05-13 16:33 UTC · Updated: 2026-06-17 09:33 UTC · Assigner: cloudflare
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.34%, 27th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-305

## 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.

## Affected vendors and products

- OPKSSH: OPKSSH

## Tracked companies

- [Cloudflare](https://rewindex.com/company/cloudflare.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-4658)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-4658)
- [https://github.com/openpubkey/opkssh](https://github.com/openpubkey/opkssh)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-4658 · Markdown: https://rewindex.com/cve/CVE-2025-4658.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-4658 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:08:57.336Z