CVE-2026-48525

A flaw was found in PyJWT. A remote attacker can exploit this by supplying an arbitrarily large Base64URL payload segment when verifying detached JSON Web Signature (JWS) tokens using the unencoded-payload option. This forces excessive CPU work and memory allocations, leading to a Denial of Service (DoS) against any endpoint verifying such tokens.

Moderate: This flaw in PyJWT, a dependency across multiple Red Hat products, allows a remote, unauthenticated attacker to trigger a Denial of Service. By submitting a specially crafted JSON Web Signature (JWS) token with an oversized unencoded payload, an attacker can force excessive CPU and memory consumption on systems verifying these tokens, leading to service disruption.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.