Regular Expression Misconfiguration in Kroxylicious by Red Hat
CVE-2026-128424

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Streams For Apache Kafka 3
Vendor
CVE Published:
13 November 2026

What is CVE-2026-128424?

A vulnerability has been identified in the Kroxylicious application where the ACL authorizer's rules-file parser improperly interprets regular-expression literals. Specifically, the parser unquotes matching slashes in such a way that escape sequences are stripped from the regular expressions. This leads to unintended matches; for example, a regex intended to match 'orders.v1' could also match other variations like 'ordersXv1'. Consequently, this flaw could allow authenticated Kafka clients excessive access to resources, such as reading from or writing to sensitive topics, violating security protocols.

References

https://access.redhat.com/security/cve/CVE-2026-128424
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2572937
issue-trackingx_refsource_REDHAT
https://github.com/kroxylicious/kroxylicious/issues/5236

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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