Rewindex/CVEs/Amazon Web Services

CVE-2026-12043: Heap double-free in AWS Common Runtime 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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H · CWE-415

Tracked companies

Amazon Web Services

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

AWS: aws-c-http

References

• CVE record on cve.org (opens in new tab)
• NVD entry (opens in new tab)
• aws.amazon.com/security/security-bulletins/2026-043-aws/ (opens in new tab)
• github.com/awslabs/aws-c-http/releases/tag/v0.11.0 (opens in new tab)
• github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98 (opens in new tab)

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• CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
• This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
• Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
• EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)