{"id":"CVE-2026-12043","summary":"Heap double-free in AWS Common Runtime aws-c-http","details":"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.","aliases":["GHSA-rmjr-3qpm-vh98"],"modified":"2026-08-12T15:31:16.217128Z","published":"2026-06-12T18:35:51.420Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12043.json","cna_assigner":"AMZN","cwe_ids":["CWE-415"]},"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-043-aws/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12043.json"},{"type":"ADVISORY","url":"https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12043"},{"type":"FIX","url":"https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/awslabs/aws-c-http","events":[{"introduced":"4abad0db65ab744614030dbfe81851ed598c8a1b"},{"fixed":"8aefd899fc3210bfd0e3fd414011a3cb708bf6e4"}],"database_specific":{"extracted_events":[{"introduced":"0.4.22"},{"last_affected":"0.10.15"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.10.15","v0.10.14","v0.10.13","v0.10.12","v0.10.11","v0.10.10","v0.10.9","v0.10.8","v0.10.7","v0.10.6","v0.10.5","v0.10.4","v0.10.3","v0.10.2","v0.10.1","v0.10.0","v0.9.7","v0.9.6","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.10","v0.8.9","v0.8.8","v0.8.7","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.15","v0.7.14","v0.7.13","v0.7.12","v0.7.11","v0.7.10","v0.7.9","v0.7.8","v0.7.7","v0.7.6","v0.7.5","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.29","v0.6.28","v0.6.27","v0.6.26","v0.6.25","v0.6.24","v0.6.23","v0.6.22","v0.6.21","v0.6.20","v0.6.19","v0.6.18","v0.6.17","v0.6.16","v0.6.15","v0.6.14","v0.6.13","v0.6.12","v0.6.11","v0.6.10","v0.6.9","v0.6.8","v0.6.7","v0.6.6","v0.6.5","v0.6.3","v0.6.4","v0.6.2","v0.6.1","v0.6.0","v0.5.19","v0.5.18","v0.5.17","v0.5.16","v0.5.15","v0.5.14","v0.5.13","v0.5.12","v0.5.11","v0.5.10","v0.5.9","v0.5.8","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.4.28","v0.4.27","v0.4.26","v0.4.25","v0.4.24","v0.4.23","v0.4.22"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12043.json","vanir_signatures_modified":"2026-08-12T15:31:16Z","vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"96872287347827358514189847538865503800","length":1720},"id":"CVE-2026-12043-1e4611ee","signature_type":"Function","signature_version":"v1","source":"https://github.com/awslabs/aws-c-http/commit/8aefd899fc3210bfd0e3fd414011a3cb708bf6e4","target":{"function":"aws_hpack_insert_header","file":"source/hpack.c"}},{"deprecated":false,"digest":{"line_hashes":["124280645356525196712215732137927032157","301642393092662340053319807357650229914","165157777276860542560711956794670399568","269278956214626889427380669948856080101","181842221093139609251344321025937765665","170262867104208531698686581472785423691","280867948920478112109425199030879810598","124492402619103279128665481606357510439"],"threshold":0.9},"id":"CVE-2026-12043-8ae36b79","signature_type":"Line","signature_version":"v1","source":"https://github.com/awslabs/aws-c-http/commit/8aefd899fc3210bfd0e3fd414011a3cb708bf6e4","target":{"file":"source/hpack.c"}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}