CVE-2025-4658

9.3 CRITICAL 0.3% exploit odds No fix listed Other Library

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2025-05-13 17:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 09:33 UTC Last updatedMost recent change to the record

Details

Published: 2025-05-13 17:16 UTC
Last modified: 2026-06-17 09:33 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-305
Record status: Analyzed

Affected

Openpubkey < 0.10.0
Openpubkey Opkssh < 0.5.0

Attack profile CVSS 4.0 · 9.3

Attack vector: Network
Complexity: Low
Attack requirements: None
Privileges needed: None
User interaction: None
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Download Square Reddit

References

https://github.com/openpubkey/opkssh

NVD record · CVE.org record