CVE-2026-12043

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.

Score

CVSS 3.1 8.8 High

Status

Awaiting Analysis - ff89ba41-3aa1-4d27-914a-91399e9639e5

Published

2026-06-12

Last modified

2026-10-26

Weaknesses

CWE-415

Affected products

• Aws-c-http (Aws)

References

• https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0
• https://aws.amazon.com/security/security-bulletins/2026-043-aws/
• https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98