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CVE-2026-3234— Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mod_cluster是mod_cluster项目的一个基于httpd的负载均衡器。 mod_cluster存在注入漏洞，该漏洞源于decodeenc函数存在CRLF注入，可能导致绕过输入验证。

CVSS 4.3 · Medium EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3234

Vulnerability Information
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Vulnerability Title
Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
mod_cluster 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mod_cluster是mod_cluster项目的一个基于httpd的负载均衡器。 mod_cluster存在注入漏洞，该漏洞源于decodeenc函数存在CRLF注入，可能导致绕过输入验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat JBoss Core Services - cpe:/a:redhat:jboss_core_services:1
Red Hat Red Hat JBoss Core Services - cpe:/a:redhat:jboss_core_services:1

II. Public POCs for CVE-2026-3234

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III. Intelligence Information for CVE-2026-3234

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Vendor Advisories for CVE-2026-3234 (2)

Same Patch Batch · Red Hat · 2026-03-12 · 4 CVEs total

CVE-2026-3099 5.8 MEDIUM Libsoup: libsoup: authentication bypass via digest authentication replay attack
CVE-2026-2376 4.9 MEDIUM Mirror-registry: quay: quay: server-side request forgery via open redirect vulnerability i
CVE-2026-2366 3.1 LOW Keycloak: keycloak: information disclosure via authorization bypass in admin api

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-93

V. Comments for CVE-2026-3234

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