Aws Application Load Balancer
Monthly
WAF managed-rule body inspection on AWS Application Load Balancer (ALB) can be bypassed by remote actors who fragment an HTTP/2 request body across multiple frames so that only a partial body is inspected before reaching the backend. The flaw (CWE-444, HTTP request smuggling) affects only ALB target groups serving HTTP/2 traffic with AWS WAF enabled, and lets attackers slip malicious payloads past WAF managed rules. No public exploit identified at time of analysis and it is not on CISA KEV; AWS scores it 7.9 (CVSS 4.0) with impact falling on the protected backend rather than the ALB itself.
WAF managed-rule body inspection on AWS Application Load Balancer (ALB) can be bypassed by remote actors who fragment an HTTP/2 request body across multiple frames so that only a partial body is inspected before reaching the backend. The flaw (CWE-444, HTTP request smuggling) affects only ALB target groups serving HTTP/2 traffic with AWS WAF enabled, and lets attackers slip malicious payloads past WAF managed rules. No public exploit identified at time of analysis and it is not on CISA KEV; AWS scores it 7.9 (CVSS 4.0) with impact falling on the protected backend rather than the ALB itself.