CVE-2026-12043: CWE-415 Double free in AWS aws-c-http
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.
AI Analysis
Technical Summary
CVE-2026-12043 is a high-severity double free vulnerability in the aws-c-http library of AWS Common Runtime. The vulnerability arises from improper handling of HPACK dynamic table size updates in HTTP/2 HEADERS frames, which can be exploited by a remote server to trigger memory corruption on a client using the affected library version. This memory corruption may lead to arbitrary code execution. The vulnerability affects aws-c-http version 0.4.22. AWS manages this as a cloud service and has provided an official fix in version 0.11.0.
Potential Impact
Successful exploitation can cause memory corruption on the client application, potentially resulting in arbitrary code execution. This impacts confidentiality, integrity, and availability of the affected client systems using aws-c-http 0.4.22. The vulnerability is remotely exploitable without privileges and requires user interaction (UI:R).
Mitigation Recommendations
An official fix is available. Users should upgrade aws-c-http to version 0.11.0 or later to remediate this vulnerability. Since this is a cloud-hosted service component, AWS manages remediation for the cloud service side. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-043-aws/ for the latest guidance and updates.
CVE-2026-12043: CWE-415 Double free in AWS aws-c-http
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.
CVSS v3.1
Score 8.8high
Affected software
pkg:github/awslabs/aws-c-httpRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-12043 is a high-severity double free vulnerability in the aws-c-http library of AWS Common Runtime. The vulnerability arises from improper handling of HPACK dynamic table size updates in HTTP/2 HEADERS frames, which can be exploited by a remote server to trigger memory corruption on a client using the affected library version. This memory corruption may lead to arbitrary code execution. The vulnerability affects aws-c-http version 0.4.22. AWS manages this as a cloud service and has provided an official fix in version 0.11.0.
Potential Impact
Successful exploitation can cause memory corruption on the client application, potentially resulting in arbitrary code execution. This impacts confidentiality, integrity, and availability of the affected client systems using aws-c-http 0.4.22. The vulnerability is remotely exploitable without privileges and requires user interaction (UI:R).
Mitigation Recommendations
An official fix is available. Users should upgrade aws-c-http to version 0.11.0 or later to remediate this vulnerability. Since this is a cloud-hosted service component, AWS manages remediation for the cloud service side. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-043-aws/ for the latest guidance and updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-06-11T19:50:48.263Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-043-aws/","vendor":"AWS"}]
Threat ID: 6a2c5612e617e2d834b0f353
Added to database: 6/12/2026, 6:55:14 PM
Last enriched: 6/12/2026, 7:09:46 PM
Last updated: 6/13/2026, 4:17:35 AM
Views: 10
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