Resource exhaustion in Authlib Joserfc
CVE-2026-119283
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.5, joserfc.jwe.decrypt_json() accepts a JWE General JSON Serialization recipients array without a count limit and calls decrypt_cek() for every entry. An unauthenticated attacker who can submit a JWE to an endpoint using an RSA key-management algorithm can choose the number of private-key decryption operations performed by one request. The verify_all_recipients option does not reduce this work because the affected loop processes every recipient before consulting that setting, allowing repeated requests to exhaust service CPU without affecting confidentiality or integrity. This issue is fixed in version 1.7.5.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Authlib Joserfc — versions < 1.7.5
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-119283?
- CVE-2026-119283 is a high-severity vulnerability in Authlib Joserfc, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-10-29.
- How severe is CVE-2026-119283?
- High severity. CVSS v3 base score is 7.5 out of 10.