Unanchored Regex Parsing Enables Request Smuggling in Apache Traffic Server

CVE-2026-22068 represents a Regular Expression Denial of Service (ReDoS) and request smuggling vulnerability in Apache Traffic Server versions 10.0.X through 10.1.3 and 9.0.X through 9.2.14. This CWE-777 weakness occurs when regex patterns lack proper anchors (^ and $), allowing attackers to craft malicious HTTP requests that bypass validation logic and potentially poison caches or smuggle requests past security controls. Organizations running affected Apache Traffic Server instances—commonly deployed as reverse proxies and load balancers—face elevated risk of cache poisoning, request smuggling attacks, and potential unauthorized access to backend systems. Immediate patching to version 9.2.15 or 10.1.4 is critical.

While this CVE maps to zero MITRE ATT&CK techniques directly, Casky's extended reasoning capabilities would detect the attack signatures associated with the underlying exploitation patterns: adversaries sending crafted HTTP requests with boundary-breaking payloads (Technique: T1071 - Application Layer Protocol), attempts to desynchronize request parsing between the proxy and backend servers (T1036 - Masquerading), and suspicious cache behavior following malformed request submissions. Practitioners using Casky would observe findings highlighting unexpected regex evaluation results in traffic analysis, detection of HTTP requests with ambiguous delimiter encoding, and anomalous backend request sequencing—indicators that an attacker is exploiting the unanchored regex to establish persistence through cache poisoning or lateral movement.