Heap double-free in AWS Common Runtime aws-c-http

Bulletin ID:  2026-043-AWS Scope:  AWS Content Type:  Important (requires attention) Publication Date:  06/12/2026 11:45 AM PDT Description: AWS Common Runtime aws-c-http is a HTTP client library used by AWS SDKs for handling http requests to AWS services. We identified CVE-2026-12043 , an issue where improper handling of HPACK dynamic table size updates in the AWS Common Runtime aws-c-http library might allow a remote 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. Impacted versions:  aws-c-http >= 0.4.22 AND Exposed in following sdk versions: aws-sdk-cpp >= 1.11.41, aws-sdk-java-v2 >= 2.44.27, Resolution: This issue has been addressed in aws-c-http version 0.11.0 . We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds: Force HTTP/1.1 connections if available. References: CVE-2026-12043 GHSA-rmjr-3qpm-vh98 Please email  aws-security@amazon.com  with any security questions or concerns.   "},"metadata":{"tags":[]}},{"fields":{"patternBoolean2":"false","id":"ams#rt-rich-textc2#pattern-data"},"metadata":{"tags":[{"name":"pattern-data","description":"Default pattern data","id":"ams#rt-rich-textc2#pattern-data","namespaceId":"rt-rich-text"}]}}]},"metadata":{"auth":{},"testAttributes":{}},"context":{"page":{"pageUrl":"https://aws.amazon.com/security/security-bulletins/2026-043-aws/"},"contentType":"page","environment":{"stage":"prod","region":"us-west-2"},"sdkVersion":"2.0.27"},"refMap":{"manifest.js":"cda3e8d042","rt-rich-text.js":"5043b0a87f","rt-rich-text.rtl.css":"6a04028f86","rt-rich-text.css":"98f5a6aee4","rt-rich-text.css.js":"3d619cc2e1","rt-rich-text.rtl.css.js":"ccdb945d3e"},"settings":{"templateMappings":{"patternHeading":"patternHeading","patternSubheading":"patternSubheading","patternDark":"patternBoolean2","title":"itemHeading","bodyText":"itemLongLoc"}}} CVE-2026-12043 - Heap double-free in AWS Common Runtime aws-c-http Bulletin ID:  2026-043-AWS Scope:  AWS Content Type:  Important (requires attention) Publication Date:  06/12/2026 11:45 AM PDT Description: AWS Common Runtime aws-c-http is a HTTP client library used by AWS SDKs for handling http requests to AWS services. We identified CVE-2026-12043 , an issue where improper handling of HPACK dynamic table size updates in the AWS Common Runtime aws-c-http library might allow a remote 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. Impacted versions:  aws-c-http >= 0.4.22 AND Exposed in following sdk versions: aws-sdk-cpp >= 1.11.41, aws-sdk-java-v2 >= 2.44.27, Resolution: This issue has been addressed in aws-c-http version 0.11.0 . We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds: Force HTTP/1.1 connections if available. References: CVE-2026-12043 GHSA-rmjr-3qpm-vh98 Please email  aws-security@amazon.com  with any security questions or concerns.   {"data":{"items":[{"fields":{"footer":"{ "createAccountButtonLabel": "Create an AWS account", "createAccountButtonURL": "https://signin.aws.amazon.com/signup?request_type=register", "backToTopText": "Back to top", "eoeText": "Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status, disability or other legally protected status. Veterans, military spouses, and people with disabilities are encouraged to apply.", "copyrightText": "© 2026, Amazon Web Services, Inc. or its affiliates. All rights reserved.", "items": [ { "name": "Learn", "linkURL": "", "items": [ { "heading": "What Is AWS?", "linkURL": "/what-is-aws/?nc1=f_cc" }, { "hea

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• aws.amazon.com/security/security-bulletins/rss/2026-043-aws/
• www.cve.org/CVERecord?id=CVE-2026-12043