Platform
linux
Component
mod_proxy_cluster
CVE-2026-3234 is a privilege escalation vulnerability found in the openclaw component. This flaw allows an attacker to silently widen paired device scope, potentially leading to Remote Code Execution (RCE) on the node. Versions of openclaw up to and including 2026.3.24 are affected; a patch is available in version 2026.3.25.
A CRLF (Carriage Return Line Feed) injection vulnerability has been identified in modproxycluster within Red Hat Enterprise Linux 10 (CVE-2026-3234). This flaw resides in the decodeenc() function and 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. The vulnerability has a CVSS score of 4.3, indicating a medium risk. While a direct fix is not currently available, understanding the exploitation context and implementing preventative measures is crucial to mitigate the risk. The lack of required authentication for exploitation increases the severity, as any attacker with network access can potentially exploit it.
CVE-2026-3234 is exploited by injecting CRLF sequences into the modproxycluster cluster configuration. This is achieved through the MCMP protocol, which requires no authentication. Once the CRLF sequences are injected, the attacker can manipulate the response body of the INFO endpoint, potentially leading to the disclosure of confidential information or alteration of system behavior. The success of exploitation depends on the attacker's ability to access the network where the cluster is running and send malicious MCMP traffic. The absence of authentication significantly facilitates exploitation, making this vulnerability a significant concern for systems exposed to untrusted networks.
Exploit Status
EPSS
0.10% (27% percentile)
CISA SSVC
CVSS Vector
As there is currently no official fix for CVE-2026-3234, the following mitigation steps are strongly recommended: Restrict network access to the MCMP (Master Cluster Management Protocol) port to trusted sources only. Implement a firewall to block unauthorized traffic to the MCMP port. Actively monitor system logs for suspicious activity related to the INFO endpoint. Consider temporarily disabling the INFO endpoint if it is not essential for operations. Keep the operating system and applications updated with the latest security patches, even if they do not directly address CVE-2026-3234, as they may fix related vulnerabilities. Conduct regular security audits to identify and address potential vulnerabilities.
Actualice Red Hat Enterprise Linux a la última versión disponible. Esto solucionará la vulnerabilidad en mod_proxy_cluster. Consulte las notas de la versión para obtener más detalles sobre la actualización.
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It's an Apache module that enables load balancing and high availability of web applications across a cluster of servers.
It's the Master Cluster Management Protocol used by modproxycluster for communication between cluster servers.
The lack of authentication means that anyone with network access can attempt to exploit the vulnerability without needing credentials.
In that case, it is recommended to temporarily disable the INFO endpoint until a fix is available.
Currently, there is no official fix, but the mitigation steps described above can help reduce the risk.
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