CVE-2026-12043

Heap double-free in AWS Common Runtime aws-c-http

State: Published
Severity: 8.7 High
Published: Jun 12, 2026
Updated: Jun 12, 2026
Reserved: Jun 11, 2026

Description

Improper handling of HPACK dynamic table size updates in the AWS Common Runtime aws-c-http library might allow a remote threat actor operating a server to cause memory corruption on a connecting client application, potentially leading to arbitrary code execution, via a crafted sequence of HTTP/2 HEADERS frames.

To remediate this issue, users should upgrade to aws-c-http version 0.11.0.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	AMZN
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	AMZN

Weaknesses

CWE-415 Double free

Affected Products

Product	Versions
aws-c-httpAWS	0.4.22 through 0.10.15Affected

References

https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0patch
https://aws.amazon.com/security/security-bulletins/2026-043-aws/vendor-advisory
https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98third-party-advisory

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