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P4
CVE-2025-61920: authlib before 1.6.5 (exclusive), < 1.6.5
CVE-2025-61920. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA). EPSS 0.00638 (percentile 0.49617), scored 19-Oct-2026.
Affected technology
authlib · before 1.6.5 (exclusive)
authlib
authlib · < 1.6.5
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
A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.
- CWE
- CWE-20, CWE-400, CWE-770
- CCR priority
- 30.2 /100 (P4)
- CVSS 3.1
- 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Vendor/CNA
- EPSS
- 0.00638 · percentile 0.49617 · 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-2025-61920.html