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CVE Record

CVE-2026-56208: Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode

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.

HighCVSS 7.6Not KEV-listedUpdated
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Potential ATT&CK relevance

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CVE-2026-56208 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
44Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H2.84.7redhat
7.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H2.84.7redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.6High
CVSS 3.1 vector shape for CVE-2026-56208Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Reported to Red Hat.

  2. ADP timelineredhat-SADP

    Made public.

  3. Source timelineredhat

    Reported to Red Hat.

  4. Source timelineredhat

    Made public.

  5. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPlibaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode
other:Red Hat severity ratingcvssV3_1
  • 2026-06-19T00:00:00.000Z: Reported to Red Hat.
  • 2026-06-19T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Enterprise Linux 10.0 Extended Update Supportfirefox, 0:140.13.0-1.el10_0affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportfirefox, 0:140.13.0-1.el7_9affected
Red HatRed Hat Enterprise Linux 8firefox, 0:140.13.0-1.el8_10affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportfirefox, 0:140.13.0-1.el8_4affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onfirefox, 0:140.13.0-1.el8_4affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportfirefox, 0:140.13.0-1.el8_6affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onfirefox, 0:140.13.0-1.el8_6affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicefirefox, 0:140.13.0-1.el8_8affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionsfirefox, 0:140.13.0-1.el8_8affected
Red HatRed Hat Enterprise Linux 9firefox, 0:140.13.0-1.el9_8affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionsfirefox, 0:140.13.0-1.el9_2affected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutionsfirefox, 0:140.13.0-1.el9_4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportfirefox, 0:140.13.0-1.el9_6affected
Red HatRed Hat Enterprise Linux AI 3.3 for RHEL 9aom, 0:3.14.0-1.el9aiaffected
Red HatRed Hat Enterprise Linux AI 3.4 for RHEL 9aom, 0:3.14.0-1.el9aiaffected
Red HatRed Hat Enterprise Linux AI 3.5 for RHEL 9aom, 0:3.14.0-1.el9aiaffected
Red HatRed Hat AI Inference Server 3.2rhaiis/vllm-cuda-rhel9, 1787860580affected
Red HatRed Hat AI Inference Server 3.2rhaiis/model-opt-cuda-rhel9, 1787772157affected
Red HatRed Hat AI Inference Server 3.2rhaiis/vllm-rocm-rhel9, 1787884873affected
Red HatRed Hat AI Inference Server 3.3rhaiis/model-opt-cuda-rhel9, 1789508287affected
Red HatRed Hat AI Inference Server 3.3rhaiis/vllm-spyre-rhel9, 1789502493affected
Red HatRed Hat AI Inference Server 3.3rhaiis/vllm-rocm-rhel9, 1789504371affected
Red HatRed Hat AI Inference Server 3.3rhaiis/vllm-cuda-rhel9, 1789582776affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/bootc-aws-cuda-rhel9, 1790936334affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/bootc-azure-cuda-rhel9, 1790936351affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/bootc-azure-rocm-rhel9, 1790850900affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/bootc-cuda-rhel9, 1790866732affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/bootc-gcp-cuda-rhel9, 1790936334affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/bootc-rocm-rhel9, 1790791893affected
Red HatRed Hat Enterprise Linux AI 3.3rhelai3/disk-image-cuda-rhel9, 1790954179affected
Weakness

CWE details

CWE-122

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-122 · source CWE mapping

Heap-based Buffer Overflow

Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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