{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-56209: Libaom: libaom: arbitrary address write via svc layer context oob and cyclic refresh map pointer hijack","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-56209","status":"final","version":"1","initial_release_date":"2026-06-19T16:28:26.462Z","current_release_date":"2026-06-19T17:47:00.627Z","revision_history":[{"date":"2026-06-19T16:28:26.462Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-56209 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-56209"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-56209"},{"category":"external","summary":"access.redhat.com","url":"https://access.redhat.com/security/cve/CVE-2026-56209"},{"category":"external","summary":"aomedia.googlesource.com","url":"https://aomedia.googlesource.com/aom/+/a93ba0ffaa"},{"category":"external","summary":"RHBZ#2490800","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2490800"},{"category":"external","summary":"issues.chromium.org","url":"https://issues.chromium.org/issues/503993984"}]},"product_tree":{"branches":[{"category":"vendor","name":"Red Hat","branches":[{"category":"product_name","name":"Red Hat Enterprise Linux 10","branches":[{"category":"product_version","name":"*","product":{"name":"Red Hat Red Hat Enterprise Linux 10 *","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:red_hat:red_hat_enterprise_linux_10:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Red Hat","branches":[{"category":"product_name","name":"Red Hat Enterprise Linux 10","branches":[{"category":"product_version","name":"*","product":{"name":"Red Hat Red Hat Enterprise Linux 10 *","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:red_hat:red_hat_enterprise_linux_10:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Red Hat","branches":[{"category":"product_name","name":"Red Hat Enterprise Linux 9","branches":[{"category":"product_version","name":"*","product":{"name":"Red Hat Red Hat Enterprise Linux 9 *","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:red_hat:red_hat_enterprise_linux_9:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Red Hat","branches":[{"category":"product_name","name":"Red Hat Enterprise Linux 9","branches":[{"category":"product_version","name":"*","product":{"name":"Red Hat Red Hat Enterprise Linux 9 *","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:red_hat:red_hat_enterprise_linux_9:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Red Hat","branches":[{"category":"product_name","name":"Red Hat Enterprise Linux AI (RHEL AI) 3","branches":[{"category":"product_version","name":"*","product":{"name":"Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 *","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:red_hat:red_hat_enterprise_linux_ai_\\(rhel_ai\\)_3:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Red Hat","branches":[{"category":"product_name","name":"Red Hat Hardened Images","branches":[{"category":"product_version","name":"*","product":{"name":"Red Hat Red Hat Hardened Images *","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:red_hat:red_hat_hardened_images:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-56209","title":"Libaom: libaom: arbitrary address write via svc layer context oob and cyclic refresh map pointer hijack","notes":[{"category":"description","text":"An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"]}]}]}