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Vulnerability · Published Oct 29, 2026 · Assigned by GitHub_M

CVE-2026-119283joserfc: Unbounded JWE General JSON `recipients` Array Leads to CPU Exhaustion (DoS) via Repeated RSA Private-Key Decryption

High 7.5

In plain English

A high-severity uncontrolled resource consumption in joserfc from authlib. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.2%top 86.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13joserfcno fix listedDEBIAN-CVE-2026-119283
Debian:14joserfc1.7.5-1DEBIAN-CVE-2026-119283
PyPIjoserfc1.7.5GHSA-jpxq-7h8p-2q76
Ubuntu:26.04:LTSjoserfcno fix listedUBUNTU-CVE-2026-119283
Ubuntu:26.10joserfcno fix listedUBUNTU-CVE-2026-119283

Affected products (as reported)

VendorProductVersions
authlib joserfc < 1.7.5

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References