CVE-2026-12043 HIGH

CVE-2026-12043: Heap double-free in AWS Common Runtime aws-c-http

Vendor Aws
Product aws-c-http
Weakness CWE-415
Published June 12, 2026
Last update June 12, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 12, 2026 CVE published
June 12, 2026 Record updated