CVE-2026-20586

HIGH
8.8
CVSS Score
Published: October 5, 2026 at 01:39 AM UTC
Updated: October 21, 2026 at 08:16 AM UTC
26 products affected across 2 vendorsMT8668 FirmwareMT8781 FirmwareMT8678 Firmware· also runs on 25 platforms

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

In vdec, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11383899; Issue ID: MSV-9614.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
mediatek-mt2718 (same device)
All versions
mediatek-mt6768 (same device)
All versions
mediatek-mt6769 (same device)
All versions
mediatek-mt6789 (same device)
All versions
mediatek-mt6833 (same device)
All versions
mediatek-mt6855 (same device)
All versions
mediatek-mt6877 (same device)
All versions
mediatek-mt8186 (same device)
All versions
mediatek-mt8188 (same device)
All versions
mediatek-mt8189 (same device)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-787

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