HTTP/2 Request Interpretation Flaw in AWS Application Load Balancer
CVE-2026-13763

7.9HIGH

Key Information:

Vendor

Aws

Status
Aws Application Load Balancer
Vendor
CVE Published:
29 June 2026

What is CVE-2026-13763?

A security flaw exists in the AWS Application Load Balancer when using HTTP/2, enabling remote attackers to potentially evade AWS WAF's managed rule body inspection. This occurs through specially crafted HTTP/2 requests that partition the request body across frames, resulting in only a portion of the body being scrutinized. This vulnerability is limited to target groups using HTTP/2 in ALB. To mitigate the risk, users are advised to configure the 'Inspect after sufficient data' settings for their ALB load balancer.

Affected Version(s)

AWS Application Load Balancer 0

References

https://docs.aws.amazon.com/elasticloadbalancing/latest/a...
mitigation
https://aws.amazon.com/security/security-bulletins/2026-0...
vendor-advisory

CVSS V4

Score:
7.9
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.