CVE-2026-36912Public exploitNetwork attack vector

Player crash via zero-sized MP4 atom

Published Jul 1, 2026 · Updated Jul 1, 2026

NULL pointer dereference in MPC-BE before commit 4341cb3 allows attackers to crash the player with a crafted MP4 file. The embedded Bento4 atom factory accepts a zero-sized MP4 atom, leaving sample-size storage null before AP4_AtomSampleTable::GetSample() reads it. The file must be opened or dragged into the Windows player, after which the invalid read terminates media playback.

CVSS severity7.5
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in MPC-BE before commit 4341cb3 allows attackers to crash the player with a crafted MP4 file. The embedded Bento4 atom factory accepts a zero-sized MP4 atom, leaving sample-size storage null before AP4_AtomSampleTable::GetSample() reads it. The file must be opened or dragged into the Windows player, after which the invalid read terminates media playback.

The record

CVE
CVE-2026-36912
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1204.002Malicious File
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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