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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Affected Vendors & Products
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Fixes
Solution
No solution given by the vendor.
Workaround
Until a fixed release is available, write regex escapes with doubled backslashes (for example `/orders\\.v1/`), audit existing `matching` rules for unintended matches, and prefer exact or `like` predicates where regex matching is not required.
References
History
Fri, 13 Nov 2026 06:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Kroxylicious-authorizer-acl: kroxylicious: acl rule file regex escapes are stripped, broadening 'matching' authorization rules | |
| First Time appeared |
Redhat
Redhat amq Streams |
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| Weaknesses | CWE-863 | |
| CPEs | cpe:/a:redhat:amq_streams:3 | |
| Vendors & Products |
Redhat
Redhat amq Streams |
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| References |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-11-13T06:41:03.642Z
Reserved: 2026-11-13T05:56:28.939Z
Link: CVE-2026-128424
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses