CVE-2026-12043

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

Published Jun 12, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Heap double-free in AWS Common Runtime aws-c-http
First Time appeared Aws
Aws aws-c-http
Weaknesses CWE-415
CPEs cpe:2.3:a:aws:aws-c-http:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws-c-http
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Jun 12, 2026, 6:49 PM
Reserved
Jun 11, 2026, 7:50 PM
Status
Awaiting Analysis
Published
Jun 12, 2026, 7:16 PM
Modified
Oct 26, 2026, 11:10 AM