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.
Published: 2026-06-12
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 12 Jun 2026 19:45:00 +0000


Fri, 12 Jun 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Fri, 12 Jun 2026 18:45:00 +0000

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-06-12T18:49:54.683Z

Reserved: 2026-06-11T19:50:48.263Z

Link: CVE-2026-12043

cve-icon Vulnrichment

Updated: 2026-06-12T18:49:51.582Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-12T19:16:26.420

Modified: 2026-06-16T15:42:57.150

Link: CVE-2026-12043

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-12T20:19:14Z

Weaknesses