CVE-2026-13763
HTTP/2 Stream Parser Confusion Body-Inspection Bypass in AWS Application Load Balancer with AWS WAF
- State
- Published
- Severity
- 7.9 High
- Published
- Jun 29, 2026
- Updated
- Jun 29, 2026
- Reserved
- Jun 29, 2026
Description
Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer with AWS WAF enabled might allow remote actors to bypass AWS WAF managed rule body inspection via crafted HTTP/2 requests that fragment the request body across frames so that only a partial body is inspected. This issue only impacts HTTP/2 ALB target groups.
To remediate this issue, customers should enable the "Inspect after sufficient data" target group configuration associated to an ALB load balancer. Refer to: ( https://docs.aws.amazon.com/elasticloadbalancing/latest/application/edit-target-group-attributes.html#waf-http2-inspection )
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.9 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H | AMZN |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | AMZN |
Weaknesses
- CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')
Affected Products
| Product | Versions |
|---|---|
AWS Application Load BalancerAWS |
|
References
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