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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 7.5 · authlibNVD modified 2026-10-29 21:10
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 3
- https://github.com/authlib/joserfc/security/advisories/GHSA-jpxq-7h8p-2q76 x_refsource_confirm
- https://github.com/authlib/joserfc/commit/d6dc8df6c7609277e741069d3733e43996c1cd17 x_refsource_misc
- https://github.com/authlib/joserfc/releases/tag/1.7.5 x_refsource_misc