Red Hat Apicurio Registry AwsAlbKeyResolver cross-domain policy

Summaryinfo

A vulnerability has been found in Red Hat Apicurio Registry, JBoss Enterprise Application Platform, JBoss Enterprise Application Platform Expansion Pack and Quarkus and classified as problematic. This issue affects some unknown processing of the component AwsAlbKeyResolver. This manipulation causes cross-domain policy. This vulnerability is registered as CVE-2026-81829. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Red Hat Apicurio Registry, JBoss Enterprise Application Platform, JBoss Enterprise Application Platform Expansion Pack and Quarkus (the affected version unknown). It has been declared as problematic. Affected by this vulnerability is an unknown part of the component AwsAlbKeyResolver. The manipulation with an unknown input leads to a cross-domain policy vulnerability. The CWE definition for the vulnerability is CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2026-81829 since 08/27/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Application Server Software

Vendor

• Red Hat

Name

• Apicurio Registry
• JBoss Enterprise Application Platform
• JBoss Enterprise Application Platform Expansion Pack
• Quarkus

License

• open-source

Website

• Vendor: https://www.redhat.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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