VulnSocial

CVE-2026-56209Patch

LOWCVSS 7.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-787

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-06-19); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-19: 1Mentions · 2026-06-25: 1Patch / Workaround · 2026-06-19: 1Technical Details · 2026-06-19: 1Technical Details · 2026-06-25: 106-1906-25
Signal classification2 categories
Patch
150.0%
Disclosure
150.0%
Classification over time
DateTotalLabels
2026-06-191
Patch1
2026-06-251
Disclosure1
Full discourse2 posts
  • DFIR Lab@DFIR_Lab
    Disclosure

    🚨 HIGH: CVE-2026-56209 (CVSS 7.1) - Arbitrary write vulnerability in libaom AV1 codec. Missing bounds check in SVC layer control allows attackers to write ~1,200 bytes at controlled addresses via crafted frames. Potential RCE. #CVE #PatchNow https://t.co/NnB7WsphW4

    Post summary

    The tweet announces CVE-2026-56209 as an arbitrary write vulnerability in the libaom AV1 codec, providing technical details such as the bounds check flaw and potential for RCE, without any mention of a PoC, exploit code, or active attacks.

    0000151
    52 followersView on X
  • Upwind Security MDR@UpwindMDR
    Patch

    🚨 High - libaom AV1 Encoder Arbitrary Address Write → RCE (CVE-2026-56209) A missing bounds check in libaom's SVC layer ID control function lets crafted image pixels inject an arbitrary pointer into the cyclic refresh map, making the encoder write ~1,200 bytes at an attacker-controlled address — deterministic, no info leak. Frames sent to a network-facing libaom encoder with SVC enabled yield DoS or potential RCE (CVSS 7.1, CWE-787). 👉 Affected: libaom (reference AV1 codec) with SVC enabled | Apply the aomedia patched build (commit a93ba0ffaa) / vendor update

    Post summary

    CVE-2026-56209 is a missing bounds check in libaom's SVC encoder that could allow RCE; however, a patched build is available for mitigation.

    0000054
    219 followersView on X

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