Vulnerability in Junkurihara Httpsig-Rs

CVE-2025-59058

httpsig-rs is a Rust implementation of IETF RFC 9421 http message signatures. Prior to version 0.0.19, the HMAC signature comparison is not timing-safe. This makes anyone who uses HS256 signature verification vulnerable to a timing attack that allows the attacker to forge a signature. Version 0.0.19 fixes the issue.

EPSS: 0.003 (18.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-59058?
CVE-2025-59058 is a medium-severity vulnerability in Junkurihara Httpsig-Rs, classified under CWE-208. CVSS score: 5.9/10. Published 2025-09-12.
How severe is CVE-2025-59058?
Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2025-59058 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.