authlib joserfc up to 1.7.4 Recipients Array joserfc.jwe joserfc.jwe.decrypt_json resource consumption

Summaryinfo

A vulnerability has been found in authlib joserfc up to 1.7.4 and classified as problematic. Affected by this issue is the function joserfc.jwe.decrypt_json of the file joserfc.jwe of the component Recipients Array. Performing a manipulation results in resource consumption. This vulnerability is identified as CVE-2026-119283. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in authlib joserfc up to 1.7.4. This affects the function joserfc.jwe.decrypt_json of the file joserfc.jwe of the component Recipients Array. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-119283 since 10/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.7.5 eliminates this vulnerability.

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Productinfo

Vendor

• authlib

Name

• joserfc

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4

Website

• Product: https://github.com/authlib/joserfc/

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