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CVE-2026-13763— HTTP/2 Stream Parser Confusion Body-Inspection Bypass in AWS Application Load Balancer with AWS WAF

Quick assessment

Affected
AWS AWS Application Load Balancer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS AWS Application Load Balancer是AWS公司的一款负载均衡产品。 AWS Application Load Balancer存在输入验证错误漏洞，该漏洞源于对HTTP/2请求的解释不一致，可能导致远程攻击者通过特制的HTTP/2请求将请求体分片到多个帧中，从而绕过AWS WAF托管规则的正文检查。

CVSS 9.8 · Critical EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1155

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS AWS Application Load Balancer affected
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I. Basic Information for CVE-2026-13763

Vulnerability Information
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Vulnerability Title
HTTP/2 Stream Parser Confusion Body-Inspection Bypass in AWS Application Load Balancer with AWS WAF
Source: CVE Program / CVE List V5
Vulnerability 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 )
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
AWS Application Load Balancer 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS AWS Application Load Balancer是AWS公司的一款负载均衡产品。 AWS Application Load Balancer存在输入验证错误漏洞，该漏洞源于对HTTP/2请求的解释不一致，可能导致远程攻击者通过特制的HTTP/2请求将请求体分片到多个帧中，从而绕过AWS WAF托管规则的正文检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS AWS Application Load Balancer 0 -

II. Public POCs for CVE-2026-13763

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III. Intelligence Information for CVE-2026-13763

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Vendor Advisories for CVE-2026-13763 (1)

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-444

V. Comments for CVE-2026-13763

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