CVE-2026-57834
Apache Software Foundation · Apache Traffic Server
Apache Traffic Server is susceptible to request smuggling attacks when processing malformed chunked HTTP messages.
Executive summary
A critical request smuggling vulnerability in Apache Traffic Server allows unauthenticated attackers to manipulate HTTP request interpretation, potentially leading to unauthorized data access or system compromise.
Vulnerability
This is an inconsistent interpretation of HTTP requests (CWE-444) vulnerability where malformed chunked messages allow for request smuggling. The attack is achievable by an unauthenticated remote actor.
Business impact
Successful exploitation allows an attacker to bypass security controls by smuggling requests, which could lead to unauthorized access to internal resources or sensitive data. Given the CVSS score of 10.0, this represents a critical risk to business operations, as it could facilitate large-scale session hijacking or cache poisoning.
Remediation
Immediate Action: Upgrade all instances of Apache Traffic Server to version 9.2.15 or 10.1.4 immediately to resolve the parsing flaw.
Proactive Monitoring: Monitor server access logs for unusual HTTP request patterns or characters that deviate from standard RFC compliance.
Compensating Controls: Deploy or tune a Web Application Firewall (WAF) to inspect and block malformed chunked HTTP requests before they reach the server.
Exploitation status
Public Exploit Available: No (exploit_available: false)
Analyst recommendation
This vulnerability presents a critical threat to infrastructure security due to the potential for request smuggling. Administrators must prioritize the application of the provided security updates to versions 9.2.15 or 10.1.4 to eliminate this attack vector.