What is CVE-2026-13763?

CVE-2026-13763 is a critical-severity vulnerability in Aws Application Load Balancer, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.8/10. Published 2026-06-29.

How severe is CVE-2026-13763?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Aws Application Load Balancer

CVE-2026-13763

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…

Vulnerability class: HTTP Request Smuggling

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Aws Application Load Balancer — versions 0

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (mitigation)

Frequently asked questions

What is CVE-2026-13763?: CVE-2026-13763 is a critical-severity vulnerability in Aws Application Load Balancer, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.8/10. Published 2026-06-29.
How severe is CVE-2026-13763?: Critical severity. CVSS v3 base score is 9.8 out of 10.