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  4. CVE 2026 3234 modproxycluster modproxycluster response body
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Back to active CVEs
Medium · CVSS 4.3CVE-2026-3234

Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injectionCVE-2026-3234

Answer in brief

CVE-2026-3234 records a Medium severity (CVSS 4.3) vulnerability in Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection. The current sources do not mark it as known exploited. The current feed maps Red Hat/jbcs-httpd24-mod_proxy_cluster (generic), Red Hat/mod_proxy_cluster (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 12, 2026Updated Nov 2, 2026Source checked Nov 2, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/jbcs-httpd24-mod_proxy_cluster (generic), Red Hat/mod_proxy_cluster (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/jbcs-httpd24-mod_proxy_clustergeneric*Not reported
Red Hat/mod_proxy_clustergeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/jbcs-httpd24-mod_proxy_cluster, Red Hat/mod_proxy_cluster.
  2. 2Review the reported fix. Source-reported workaround: Restrict network access to the MCMP protocol port (typically 6666) for systems running Apache mod_proxy_cluster. Configure firewall rules to limit inbound connections to this port only from trusted internal or management networks. This action reduces the attack surface by preventing unauthorized remote access to the vulnerable service. A service reload or restart may be required for firewall changes to take full effect.

Evidence timeline and material changes

  1. Published upstream

    Mar 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 2, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the response body of INFO endpoint responses. Exploitation requires network access to the MCMP protocol port, but no authentication is needed.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-93
Source
CVE List V5
Source checked
Nov 2, 2026
References
2 linked sources
Open source record