CVE-2026-13762 and CVE-2026-13763 - Issue with HTTP/2 multi-frame request body inspection in AWS WAF

unknownCVE-2026-13762 CVE-2026-13763

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

vendor: AWS product: AWS WAFOther

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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Details

Source: AWS Security Bulletins (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-06-29
Exploitation: Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-048-aws/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-137620.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all scored CVEs.
Low exploitation riskCVE-2026-137630.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-13762	coverage & exploitation status	NVD · CVE.org
CVE-2026-13763	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for and CVE-2026-13763 -

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalCVE-2026-13763: Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer with AWS WAF e…nvd · 2026-06-29