CVE-2026-81829: Smallrye-jwt: quarkus-smallrye-jwt: smallrye-jwt: unauthenticated same-origin ssrf via unsanitized jwt kid header in awsalbkeyresolver
Red Hat · Red Hat build of Quarkus 3.27.5.SP2
Vendor fix available · Affected: Red Hat build of Quarkus 3.27.5.SP2 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 48% of scored CVEs
DescriptionCVE.org
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 products8
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Red Hat build of Quarkus 3.27.5.SP2Versions not stated
- Red Hat · Red Hat build of Quarkus 3.33.3.SP2Versions not stated
- Red Hat · Exploit IntelligenceVersions not stated
- Red Hat · Red Hat build of Apicurio Registry 3Versions not stated
- Red Hat · Red Hat build of Apicurio Registry 3Versions not stated
- Red Hat · Red Hat build of QuarkusVersions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 8Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform Expansion PackVersions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Red Hat
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-81829 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.