CVE-2026-13762 PUBLISHED

HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF

Assigner: AMZN
Reserved: 29.06.2026 Published: 29.06.2026 Updated: 29.06.2026

Inconsistent interpretation of HTTP/2 requests in Amazon CloudFront 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 frames so that only a partial body is inspected.

This issue was remediated server-side. No customer action is required.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
CVSS Score: 7.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	High
Attack Requirements	None	Availability	None	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	AWS
Product	Amazon CloudFront
Versions	Default: unaffected Version 0 is affected

References

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

Problem Types

CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') CWE

Impacts

CAPEC-278 Web Services Protocol Manipulation