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

> CVE-2026-12043: Heap double-free in AWS Common Runtime aws-c-http. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-12043
Last updated: 2026-06-17T10:14:36Z

- Published: 2026-06-12 18:35 UTC · Updated: 2026-06-17 10:14 UTC · Assigner: AMZN
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 0.35%, 28th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-415

## 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.

## Affected vendors and products

- AWS: aws-c-http

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-12043)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-12043)
- [https://aws.amazon.com/security/security-bulletins/2026-043-aws/](https://aws.amazon.com/security/security-bulletins/2026-043-aws/)
- [https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0](https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0)
- [https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98](https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-12043 · Markdown: https://rewindex.com/cve/CVE-2026-12043.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-12043 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:45.333Z