{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-12043: Heap double-free in AWS Common Runtime aws-c-http","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-12043","status":"final","version":"1","initial_release_date":"2026-06-12T18:35:51.420Z","current_release_date":"2026-06-12T18:49:54.683Z","revision_history":[{"date":"2026-06-12T18:35:51.420Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-12043 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-12043"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-12043"},{"category":"external","summary":"github.com","url":"https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0"},{"category":"external","summary":"aws.amazon.com","url":"https://aws.amazon.com/security/security-bulletins/2026-043-aws/"},{"category":"external","summary":"github.com","url":"https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98"}]},"product_tree":{"branches":[{"category":"vendor","name":"AWS","branches":[{"category":"product_name","name":"aws-c-http","branches":[{"category":"product_version_range","name":">=0.4.22 <=0.10.15","product":{"name":"AWS aws-c-http >=0.4.22 <=0.10.15","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:aws:aws-c-http:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-12043","title":"Heap double-free in AWS Common Runtime aws-c-http","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}