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 remediated server-side without requiring customer intervention. CVE-2026-13763 affects AWS WAF with ALB, where crafted multi-frame HTTP/2 requests could cause partial inspection of the request body. AWS addressed this by releasing a new ALB configuration option that accumulates HTTP/2 data frames before inspection. Customers must update their ALB WAF HTTP/2 inspection settings to enable this protection. No workarounds exist, and the fix involves configuration changes rather than software patches.
Potential Impact
If unmitigated, CVE-2026-13763 could allow crafted HTTP/2 multi-frame requests to evade full inspection by AWS WAF on ALB, potentially reducing the effectiveness of the web application firewall. CVE-2026-13762 has been fully remediated by AWS on the CloudFront deployment side with no customer action needed. There are no known exploits in the wild. The severity is assessed as low.
Mitigation Recommendations
For CVE-2026-13762, no customer action is required as AWS remediated the issue server-side for CloudFront deployments. For CVE-2026-13763, customers using AWS WAF with ALB should review and update the WAF HTTP/2 traffic inspection behavior by configuring the target group attributes for HTTP/2 endpoints as per the AWS developer guide. This configuration enables ALB to accumulate HTTP/2 data frames before AWS WAF inspection, ensuring full request body inspection. No workarounds are available.
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 remediated server-side without requiring customer intervention. CVE-2026-13763 affects AWS WAF with ALB, where crafted multi-frame HTTP/2 requests could cause partial inspection of the request body. AWS addressed this by releasing a new ALB configuration option that accumulates HTTP/2 data frames before inspection. Customers must update their ALB WAF HTTP/2 inspection settings to enable this protection. No workarounds exist, and the fix involves configuration changes rather than software patches.
Potential Impact
If unmitigated, CVE-2026-13763 could allow crafted HTTP/2 multi-frame requests to evade full inspection by AWS WAF on ALB, potentially reducing the effectiveness of the web application firewall. CVE-2026-13762 has been fully remediated by AWS on the CloudFront deployment side with no customer action needed. There are no known exploits in the wild. The severity is assessed as low.
Mitigation Recommendations
For CVE-2026-13762, no customer action is required as AWS remediated the issue server-side for CloudFront deployments. For CVE-2026-13763, customers using AWS WAF with ALB should review and update the WAF HTTP/2 traffic inspection behavior by configuring the target group attributes for HTTP/2 endpoints as per the AWS developer guide. This configuration enables ALB to accumulate HTTP/2 data frames before AWS WAF inspection, ensuring full request body inspection. No workarounds are available.
Technical Details
- Article Source
- {"url":"https://aws.amazon.com/security/security-bulletins/rss/2026-048-aws/","fetched":true,"fetchedAt":"2026-06-29T20:14:38.087Z","wordCount":219}
- Classification
- {"confidence":0.88,"severitySource":"default","classifier":"rss-v2"}
Threat ID: 6a42d22e27e9c79719700dbf
Added to database: 06/29/2026, 20:14:38 UTC
Last enriched: 07/06/2026, 21:11:01 UTC
Last updated: 09/28/2026, 14:06:57 UTC
Views: 487
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