CVE-2026-13762 and CVE-2026-13763 - Issue with HTTP/2 multi-frame request body inspection in AWS WAF
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.
AI Analysis
Technical Summary
AWS WAF has two related vulnerabilities involving HTTP/2 multi-frame request body inspection. CVE-2026-13762 affects AWS WAF with CloudFront and was fixed server-side without requiring customer intervention. CVE-2026-13763 affects AWS WAF with ALB, where crafted multi-frame HTTP/2 requests could cause incomplete inspection of the request body. AWS released a configuration option on ALB to accumulate HTTP/2 data frames before inspection, addressing this issue. Customers using ALB must update their WAF HTTP/2 traffic inspection settings to ensure full protection. No workarounds are available, and detailed guidance is provided in the AWS developer guide.
Potential Impact
If unmitigated on ALB deployments, crafted multi-frame HTTP/2 requests could bypass full inspection by AWS WAF, potentially allowing malicious payloads to evade detection. The CloudFront-related issue is fully remediated server-side with no customer action needed. The ALB issue requires customer configuration to ensure complete inspection. There are no known exploits in the wild. The severity is assessed as low.
Mitigation Recommendations
For CVE-2026-13762 (CloudFront), no customer action is required as the fix was applied server-side by AWS. For CVE-2026-13763 (ALB), customers must review and update the AWS WAF HTTP/2 traffic inspection behavior by enabling the new configuration option under ALB target group attributes for HTTP/2 endpoints. This setting allows ALB to accumulate HTTP/2 data frames before inspection, ensuring full request body analysis. No workarounds exist. Customers should consult the AWS developer guide for detailed configuration instructions.
CVE-2026-13762 and CVE-2026-13763 - Issue with HTTP/2 multi-frame request body inspection in AWS WAF
Description
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
AWS WAF has two related vulnerabilities involving HTTP/2 multi-frame request body inspection. CVE-2026-13762 affects AWS WAF with CloudFront and was fixed server-side without requiring customer intervention. CVE-2026-13763 affects AWS WAF with ALB, where crafted multi-frame HTTP/2 requests could cause incomplete inspection of the request body. AWS released a configuration option on ALB to accumulate HTTP/2 data frames before inspection, addressing this issue. Customers using ALB must update their WAF HTTP/2 traffic inspection settings to ensure full protection. No workarounds are available, and detailed guidance is provided in the AWS developer guide.
Potential Impact
If unmitigated on ALB deployments, crafted multi-frame HTTP/2 requests could bypass full inspection by AWS WAF, potentially allowing malicious payloads to evade detection. The CloudFront-related issue is fully remediated server-side with no customer action needed. The ALB issue requires customer configuration to ensure complete inspection. There are no known exploits in the wild. The severity is assessed as low.
Mitigation Recommendations
For CVE-2026-13762 (CloudFront), no customer action is required as the fix was applied server-side by AWS. For CVE-2026-13763 (ALB), customers must review and update the AWS WAF HTTP/2 traffic inspection behavior by enabling the new configuration option under ALB target group attributes for HTTP/2 endpoints. This setting allows ALB to accumulate HTTP/2 data frames before inspection, ensuring full request body analysis. No workarounds exist. Customers should consult the AWS developer guide for detailed configuration instructions.
Technical Details
- Article Source
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Threat ID: 6a42d22e27e9c79719700dbf
Added to database: 06/29/2026, 20:14:38 UTC
Last enriched: 06/29/2026, 20:14:53 UTC
Last updated: 06/30/2026, 03:54:16 UTC
Views: 25
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