{"id":"CVE-2026-12043","aliases":["EUVD-2026-36541","GHSA-rmjr-3qpm-vh98"],"status":"published","title":"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.\n\n\n\nTo remediate this issue, users should upgrade to aws-c-http version 0.11.0.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00346,"percentile":0.28461,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-415"],"published":"2026-06-12T18:35:51Z","modified":"2026-10-28T10:45:48Z","products":[{"vendor":"aws","product":"aws-c-http"}],"references":[{"url":"https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0","tags":["patch","fix"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-043-aws/","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12043.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12043","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-12043","title":"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.\n\n\n\nTo remediate this issue, users should upgrade to aws-c-http version 0.11.0.","status":"published","published":"2026-06-12T18:35:51.42Z","modified":"2026-06-12T18:49:54.683Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T14:19:47.998488Z"}],"euvd":[{"id":"EUVD-2026-36541","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.\n\n\n\nTo remediate this issue, users should upgrade to aws-c-http version 0.11.0.","status":"published","published":"2026-06-12T18:35:51Z","modified":"2026-06-12T18:49:54Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:20:43.222Z"}],"nvd":[{"id":"CVE-2026-12043","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.\n\n\n\nTo remediate this issue, users should upgrade to aws-c-http version 0.11.0.","status":"published","published":"2026-06-12T19:16:26.42Z","modified":"2026-10-26T11:10:00.157Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T14:12:23.846948Z"}],"osv":[{"id":"CVE-2026-12043","title":"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.\n\n\n\nTo remediate this issue, users should upgrade to aws-c-http version 0.11.0.","status":"published","published":"2026-06-12T18:35:51.42Z","modified":"2026-10-28T10:45:48.250012862Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T15:44:57.354194Z"}]}}