Bug 2572937 (CVE-2026-128424)

Summary: CVE-2026-128424 kroxylicious-authorizer-acl: Kroxylicious: ACL rule file regex escapes are stripped, broadening 'matching' authorization rules
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: chfoley, jturenov, swoodman
Target Milestone: ---Keywords: Security
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OS: Linux   
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A flaw was found in Kroxylicious. The ACL authorizer's rules-file parser unquotes `matching /…/` regular-expression literals using the string unquoting rules, which strips every backslash escape. As a result, an allow rule such as `matching /orders\.v1/` is compiled as the regex `orders.v1`, which also matches unintended names such as `ordersXv1`, and character classes such as `\d` and `\w` lose their special meaning. Allow rules written with regex escapes can therefore apply to more resources than the author intended. Depending on the ACL configuration, this may allow an authenticated Kafka client to access a resource (such as read or write a topic) that should have been denied.
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Description OSIDB Bzimport 2026-11-13 05:47:55 UTC
A flaw was found in Kroxylicious. The ACL authorizer's rules-file parser unquotes `matching /…/` regular-expression literals using the string unquoting rules, which strips every backslash escape. An allow rule such as `matching /orders\.v1/` is compiled as the regex `orders.v1`, which also matches unintended names such as `ordersXv1`, and character classes such as `\d` and `\w` lose their special meaning. Depending on the ACL configuration, this may allow an authenticated Kafka client to access a resource that should have been denied.

Originally reported upstream in the open: https://github.com/kroxylicious/kroxylicious/issues/5236 (public since 2026-10-28). Draft advisory: GHSA-x5xx-3j9w-x63g. Formal CVE request: PSIRTSUPT-30443. Distinct from CVE-2026-118952 (ACL prefix-matching bypass in the same component).