CVE-2026-81829 (GCVE-0-2026-81829)

Vulnerability from cvelistv5 – Published: 2026-09-17 14:01 – Updated: 2026-10-09 16:26
VLAI
Title
Smallrye-jwt: quarkus-smallrye-jwt: smallrye-jwt: unauthenticated same-origin ssrf via unsanitized jwt kid header in awsalbkeyresolver
Summary
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 15:45 UTC
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1072 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:69440 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:69470 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-81829 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2524980 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-09-17 13:10
Credits
This issue was discovered by Sandipan Roy (Red Hat).
Show details on NVD website
To clipboard 

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              "url": "https://access.redhat.com/errata/RHSA-2026:69440"
            },
            {
              "name": "RHSA-2026:69470",
              "tags": [
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                "x_refsource_REDHAT"
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              "url": "https://access.redhat.com/errata/RHSA-2026:69470"
            },
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              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
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              "url": "https://access.redhat.com/security/cve/CVE-2026-81829"
            },
            {
              "name": "RHBZ#2524980",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524980"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-08-27T13:44:10.828Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-09-17T13:10:22.000Z",
              "value": "Made public."
            }
          ],
          "title": "Smallrye-jwt: quarkus-smallrye-jwt: smallrye-jwt: unauthenticated same-origin ssrf via unsanitized jwt kid header in awsalbkeyresolver",
          "workarounds": [
            {
              "lang": "en",
              "value": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-81829",
        "datePublished": "2026-09-17T14:01:30.083Z",
        "dateReserved": "2026-08-27T13:55:30.358Z",
        "dateUpdated": "2026-10-09T16:26:17.785Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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