joserfc PBES2 p2c Unbounded Iteration Count enables Denial of Service (DoS)
概要
joserfc PBES2 p2c Unbounded Iteration Count enables Denial of Service (DoS)
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service (DoS) via CPU exhaustion. When the library decrypts a JSON Web Encryption (JWE) token using Password-Based Encryption (PBES2) algorithms, it reads the p2c (PBES2 Count) parameter directly from the token's protected header. This parameter defines the number of iterations for the PBKDF2 key derivation function. Because joserfc does not validate or bound this value, an attacker can specify an extremely large iteration count (e.g., 2^31 - 1), forcing the server to expend massive CPU resources processing a single token. This vulnerability exists at the JWA layer and impacts all high-level JWE and JWT decryption interfaces if PBES2 algorithms are allowed by the application's policy.
出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Debian DEBIAN-CVE-2026-27932 joserfc
- Ubuntu UBUNTU-CVE-2026-27932 joserfc
参照URL
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com