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P4
CVE-2025-59420: authlib before 1.6.4 (exclusive), < 1.6.4
CVE-2025-59420. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA). EPSS 0.00262 (percentile 0.16901), scored 19-Oct-2026.
Affected technology
authlib · before 1.6.4 (exclusive)
authlib
authlib · < 1.6.4
authlib
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
An attacker can craft a signed token with a critical header (for example, bork or cnf) that strict verifiers reject but Authlib accepts. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and availability impact as none; integrity impact as high.
- CWE
- CWE-345, CWE-863
- CCR priority
- 30.1 /100 (P4)
- CVSS 3.1
- 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N · Vendor/CNA
- EPSS
- 0.00262 · percentile 0.16901 · 2026-10-19
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-19 17:57:47.606446+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2025-59420.html