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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- 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/security/advisories/GHSA-rmjr-3qpm-vh98
FAQ
What is CVE-2026-12043?
CVE-2026-12043 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 clien...
How severe is CVE-2026-12043?
CVE-2026-12043 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-12043?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.