CVE-2026-81829: Red Hat Exploit Intelligence

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

A flaw was found in SmallRye JWT's AwsAlbKeyResolver, which is used by applications to verify JSON Web Tokens signed by AWS Application Load Balancers. When the AWS_ALB key provider is configured, the resolver constructs the key-fetch URL by directly concatenating the attacker-controlled kid header value from an inbound JWT without sanitizing path traversal characters or query-string separators. This allows an unauthenticated remote attacker to force the application server to issue GET requests to arbitrary paths on the same origin as the configured key endpoint. As a result, non-public endpoints or internal data reachable on that origin may be read by the attacker before JWT signature verification takes place.

Affected products

• Red Hat Exploit Intelligence
• Red Hat Red Hat Build Of Apicurio Registry 3
• Red Hat Red Hat Build Of Quarkus
• Red Hat Red Hat Build Of Quarkus 3.27.5.sp2
• Red Hat Red Hat Build Of Quarkus 3.33.3.sp2
• Red Hat Red Hat JBoss Enterprise Application Platform 8
• Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack

Published 2026-09-17. Last modified 2026-10-09.