# CVE-2026-118952: Kroxylicious-authorizer-acl: kroxylicious: acl prefix matching can bypass authorization rules

Status: published. Published: 2026-10-30. Updated: 2026-11-12.

A flaw was found in the Kroxylicious ACL authorizer. Its prefix-matching logic may apply a rule to a principal of a different type, or fail to check a broader matching rule when prefixes overlap. Depending on the ACL configuration, this may allow an authenticated Kafka client to access a resource (such as read a topic) that should be denied.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Red Hat / streams for Apache Kafka 2 (kroxylicious-authorizer-acl): Version range not reported. Source: CNA: redhat
- Red Hat / streams for Apache Kafka 3 (kroxylicious-authorizer-acl): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.23% as of 2026-11-12; percentile 14.03%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-863

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-118952 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2563276 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/kroxylicious/kroxylicious/security/advisories/GHSA-qvv3-6w3q-hgqc (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-118952; retrieved 2026-11-12; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118952; retrieved 2026-11-12; source updated Not reported

Revision: 35c013f60b6912bd84065c6a3010ab8337b69af758cb499cd50d5820aa3d142a

Canonical: https://y2.dev/cve/CVE-2026-118952

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