CVE-2026-13763

criticalCVSS 9.8covered by 2 sourcesfirst seen 2026-06-29

Bulletin ID: 2026-048-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 06/29/2026 11:15 PM PDT Description: AWS WAF is a web application firewall that monitors the HTTP(S) requests that are forwarded to your protected web application resources. We identified CVE-2026-13762 and CVE-2026-13763, which are issues affecting HTTP/2 multi-frame request body inspection by AWS WAF. CVE-2026-13762 affects AWS WAF deployment with CloudFront. This issue was remediated server-side; no customer action is required. CVE-2026-13763 affects AWS WAF deployment with AWS Application Load Balancer (ALB). Under certain conditions, a crafted multi-frame HTTP/2 request could cause only a partial request body to be inspected. This issue has been addressed on ALB, and customers can ensure full protection by configuring how AWS WAF inspects HTTP/2 request bodies on their ALB. Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

What: Issues with HTTP/2 multi-frame request body inspection in AWS WAF could lead to incomplete request body processing.
Who is affected: AWS WAF deployments with Application Load Balancer (ALB) are affected.
Urgency: Remediation is important to ensure full protection against crafted requests.
Action: Configure AWS WAF to properly inspect HTTP/2 request bodies on ALB.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.

Advisory coverage (2)

criticalCVE-2026-13763: Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer with AWS WAF e…nvd · 2026-06-29
unknownCVE-2026-13762 and CVE-2026-13763 - Issue with HTTP/2 multi-frame request body inspection in AWS WAFaws · 2026-06-29

External references

NVD record for CVE-2026-13763

CVE.org record

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