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

Quick assessment

Affected
AWS aws-c-http
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS aws-c-http是AWS的一个HTTP连接库组件。 AWS aws-c-http存在资源管理错误漏洞，该漏洞源于对HPACK动态表大小更新处理不当，可能导致远程威胁者通过特制的HTTP/2 HEADERS帧序列造成内存损坏，进而导致任意代码执行。

CVSS 8.8 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS aws-c-http 0.4.22≤ 0.10.15 affected
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I. Basic Information for CVE-2026-12043

Vulnerability Information
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Vulnerability Title
Heap double-free in AWS Common Runtime aws-c-http
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
aws-c-http 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS aws-c-http是AWS的一个HTTP连接库组件。 AWS aws-c-http存在资源管理错误漏洞，该漏洞源于对HPACK动态表大小更新处理不当，可能导致远程威胁者通过特制的HTTP/2 HEADERS帧序列造成内存损坏，进而导致任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS aws-c-http 0.4.22 ~ 0.10.15 -

II. Public POCs for CVE-2026-12043

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10271 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-12043

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Patches & Fixes for CVE-2026-12043 (1)

Vendor Advisories for CVE-2026-12043 (2)

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-415

V. Comments for CVE-2026-12043

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