Apache Traffic Server Stack Exhaustion via URI Signing Plugins

CVE-2026-58181 is a stack exhaustion vulnerability affecting Apache Traffic Server's uri_signing and url_sig plugins across multiple versions (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3). The vulnerability stems from CWE-121 (stack-based buffer overflow) where specially crafted attacker input causes the plugins to consume excessive stack memory, leading to denial of service through application crashes. This impacts organizations running Apache Traffic Server as a reverse proxy or content delivery layer, particularly those relying on URL signature validation for access control or content protection. The high CVSS score of 7.5 reflects the ease of exploitation and availability impact, though it does not require authentication or user interaction.

While this CVE does not map to specific MITRE ATT&CK techniques in the current threat framework, Casky's 754 security skills powered by Claude AI would identify the attack patterns through resource exhaustion detection and input validation analysis. Practitioners using Casky would observe findings related to abnormal memory consumption patterns, recursive input processing behaviors, and malformed URI parameters that trigger stack allocation anomalies. The platform's extended reasoning capability would flag suspicious request characteristics—such as deeply nested encoding schemes or oversized signature parameters—that precede the crash condition. Security teams would receive alerts on these attack indicators before exploitation occurs, enabling them to patch to versions 9.2.15 or 10.1.4 proactively and implement input sanitization rules on their Traffic Server instances.