Bug 2449822 (CVE-2026-33204)

Summary: CVE-2026-33204 SimpleJWT: SimpleJWT: Denial of Service via JWE header tampering
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dschmidt, erezende, jlanda, jmitchel, kshier, pbohmill, simaishi, smcdonal, stcannon, teagle, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in SimpleJWT, a PHP library for JSON Web Tokens. An unauthenticated attacker can exploit this vulnerability by tampering with JSON Web Encryption (JWE) headers when Password-Based Key Derivation Function 2 (PBES2) algorithms are in use. This can lead to a Denial of Service (DoS) if an application calls JWE::decrypt() on attacker-controlled JWEs, making the affected application unavailable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-03-20 23:02:08 UTC
SimpleJWT is a simple JSON web token library written in PHP. Prior to version 1.1.1, an unauthenticated attacker can perform a Denial of Service via JWE header tampering when PBES2 algorithms are used. Applications that call JWE::decrypt() on attacker-controlled JWEs using PBES2 algorithms are affected. This issue has been patched in version 1.1.1.