CVE-2026-56208

Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode

Published Jun 19, 2026 CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Description
A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution.

Remediation

Vendor Workaround

There is no complete mitigation for this vulnerability. The following measures can reduce risk: 1. If using libaom as a standalone encoder library, avoid setting g_lag_in_frames to values >= 1 when processing untrusted input, or validate all encoder configuration parameters before passing them to the libaom API. 2. For Firefox and Thunderbird, ensure browsers are updated to versions that include the patched libaom (v3.14.0 or later). 3. For standalone libaom deployments (RHEL-AI, Hummingbird), restrict access to the encoding service to trusted clients only. 4. Apply network-level access controls to limit who can submit video for encoding.

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4774-1 aom security update
Debian DSA Debian DSA DSA-6411-1 aom security update
Ubuntu USN Ubuntu USN USN-8772-1 AOM vulnerabilities
References
Link Providers
https://access.redhat.com/errata/RHSA-2026:30814 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:42875 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:47104 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:47105 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:51100 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:51146 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54180 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54181 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54182 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54185 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54248 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54249 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54259 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:54339 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:60520 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:61627 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:61628 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:61629 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68634 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68637 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68638 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68639 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68640 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68696 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68697 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68698 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68699 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68708 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68709 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:68710 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69927 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69929 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69930 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69931 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69932 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69933 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69934 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69935 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71392 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71393 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71394 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71395 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71396 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71397 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71398 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71399 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:71401 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:74771 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:75652 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:75654 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:75657 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:75658 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:75659 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:75660 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:76041 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:76042 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:76043 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:84734 cve-icon cve-icon
https://access.redhat.com/security/cve/CVE-2026-56208 cve-icon cve-icon
https://aomedia.googlesource.com/aom/+/243f8ae84b cve-icon cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2490799 cve-icon cve-icon
https://issues.chromium.org/issues/504317456 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-56208 cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56208.json cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-56208 cve-icon
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift_ai:3.4::el9
References
Type Values Removed Values Added
First Time appeared Redhat rhel Els
Redhat rhel Eus
Redhat rhel Tus
CPEs cpe:/o:redhat:enterprise_linux:7 cpe:/a:redhat:rhel_aus:8.6::appstream
cpe:/a:redhat:rhel_e4s:8.8::appstream
cpe:/a:redhat:rhel_eus:9.6::appstream
cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
cpe:/a:redhat:rhel_tus:8.8::appstream
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
Redhat rhel Eus
Redhat rhel Tus
References
Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
CPEs cpe:/a:redhat:rhel_e4s:9.4::appstream
cpe:/o:redhat:enterprise_linux_eus:10.0
Vendors & Products Redhat enterprise Linux Eus
References
Type Values Removed Values Added
First Time appeared Redhat rhel E4s
CPEs cpe:/a:redhat:rhel_e4s:9.2::appstream
Vendors & Products Redhat rhel E4s
References
Type Values Removed Values Added
First Time appeared Redhat rhel Aus
Redhat rhel Eus Long Life
CPEs cpe:/a:redhat:rhel_aus:8.4::appstream
cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Vendors & Products Redhat rhel Aus
Redhat rhel Eus Long Life
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux_ai:3.3::el9
cpe:/a:redhat:enterprise_linux_ai:3.4::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:9::appstream
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:8::appstream
References
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux_ai:3 cpe:/a:redhat:enterprise_linux_ai:3.5::el9
References
Type Values Removed Values Added
First Time appeared Redhat ai Inference Server
Redhat openshift Ai
CPEs cpe:/a:redhat:ai_inference_server:3
cpe:/a:redhat:openshift_ai
Vendors & Products Redhat ai Inference Server
Redhat openshift Ai
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Aomedia
Aomedia libaom
Redhat hardened Images
Vendors & Products Aomedia
Aomedia libaom
Redhat hardened Images
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution.
Title Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode
First Time appeared Redhat
Redhat enterprise Linux
Redhat enterprise Linux Ai
Redhat hummingbird
Weaknesses CWE-122
CPEs cpe:/a:redhat:enterprise_linux_ai:3
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat enterprise Linux Ai
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'}