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.
History

Fri, 09 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat quarkus
CPEs cpe:/a:redhat:quarkus:3
cpe:/a:redhat:quarkus:3.27::el8
cpe:/a:redhat:quarkus:3.33::el8
Vendors & Products Redhat quarkus
References

Mon, 21 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:quarkus:3
Vendors & Products Redhat quarkus
References

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat build Of Apicurio Registry
Redhat build Of Quarkus
Redhat jboss Enterprise Application Platform Expansion Pack
Redhat smallrye Health
Vendors & Products Redhat build Of Apicurio Registry
Redhat build Of Quarkus
Redhat jboss Enterprise Application Platform Expansion Pack
Redhat smallrye Health

Fri, 18 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 17 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 17 Sep 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Smallrye-jwt: quarkus-smallrye-jwt: smallrye-jwt: unauthenticated same-origin ssrf via unsanitized jwt kid header in awsalbkeyresolver
First Time appeared Redhat
Redhat apicurio Registry
Redhat exploit Intelligence
Redhat jboss Enterprise Application Platform
Redhat jbosseapxp
Redhat quarkus
Weaknesses CWE-22
CPEs cpe:/a:redhat:apicurio_registry:3
cpe:/a:redhat:exploit_intelligence:0
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:quarkus:3
Vendors & Products Redhat
Redhat apicurio Registry
Redhat exploit Intelligence
Redhat jboss Enterprise Application Platform
Redhat jbosseapxp
Redhat quarkus
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-09-17T14:01:30.083Z

Updated: 2026-10-09T16:26:17.785Z

Reserved: 2026-08-27T13:55:30.358Z

Link: CVE-2026-81829

cve-icon Vulnrichment

Updated: 2026-09-17T15:45:23.956Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-17T14:17:32.323

Modified: 2026-10-09T17:16:50.293

Link: CVE-2026-81829

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-17T13:10:22Z

Links: CVE-2026-81829 - Bugzilla