Kroxylicious-authorizer-acl: kroxylicious: acl rule file regex escapes are stripped, broadening 'matching' authorization rules

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128424
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 07:17:20 UTC
Updated2026-11-13 07:17:20 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-863 | CWE-863 Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNACVSS5.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Streams For Apache Kafka 3 Not specified Not specified

References

ReferenceSourceLinkTags
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
github.com/kroxylicious/kroxylicious/issues/5236 [email protected] github.com
access.redhat.com/security/cve/CVE-2026-128424 [email protected] access.redhat.com
github.com/kroxylicious/kroxylicious/pull/5294 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Carles Arnal (IBM) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-11-10T00:00:00.000ZReported to Red Hat.
CNA2026-10-28T00:00:00.000ZMade public.

Workarounds

CNA: 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.

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