Description
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.
Published: 2026-06-19
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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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 with SVC enabled, validate that spatial_layer_id and temporal_layer_id values are within the configured range [0, configured_layers) before calling aom_codec_control with AV1E_SET_SVC_LAYER_ID. 2. Restrict access to encoding services to trusted clients only. Do not expose libaom SVC encoder configuration to untrusted input. 3. For Firefox and Thunderbird, ensure browsers are updated to versions that include the patched libaom (v3.14.0 or later). 4. Deploy encoding services with ASLR, stack canaries, and other exploit mitigation technologies enabled.

Tracking

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Advisories

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History

Mon, 29 Jun 2026 01:30:00 +0000

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'}


Mon, 29 Jun 2026 00:30:00 +0000

Type Values Removed Values Added
References

Wed, 24 Jun 2026 21:00:00 +0000

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

Mon, 22 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Sat, 20 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Fri, 19 Jun 2026 18:15:00 +0000

Type Values Removed Values Added
Description 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 Libaom: libaom: arbitrary address write via svc layer context oob and cyclic refresh map pointer hijack
First Time appeared Redhat
Redhat enterprise Linux
Redhat enterprise Linux Ai
Redhat hummingbird
Weaknesses CWE-787
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': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'}


Subscriptions

Aomedia Libaom
Redhat Enterprise Linux Enterprise Linux Ai Hardened Images Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-06-29T00:06:40.574Z

Reserved: 2026-06-19T15:50:16.801Z

Link: CVE-2026-56209

cve-icon Vulnrichment

Updated: 2026-06-22T16:56:10.888Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-19T00:00:00Z

Links: CVE-2026-56209 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-24T20:41:44Z

Weaknesses