Injection Flaw in mod_proxy_cluster Affects Red Hat Products
CVE-2026-3234

4.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 9
Red Hat Jboss Core Services
Vendor
CVE Published:
12 March 2026

What is CVE-2026-3234?

A vulnerability exists within mod_proxy_cluster that enables remote attackers to execute a Carriage Return Line Feed (CRLF) injection through the decodeenc() function. This flaw permits the manipulation of cluster configuration by injecting CRLF sequences, potentially resulting in corrupted responses from INFO endpoints. Network access to the MCMP protocol port is necessary for exploitation, but it does not require any form of authentication.

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References

https://access.redhat.com/security/cve/CVE-2026-3234
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442889
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Coty Sutherland (@csutherl) (IBM) for reporting this issue.
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