CVE-2025-55643Public exploit

Crash via malformed DASH segmentation metadata

Published Jun 15, 2026 · Updated Jun 15, 2026

NULL pointer dereference in GPAC MP4Box 2.4 allows attackers to crash the process via a crafted MP4 during DASH segmentation. Malformed mvcC or stsz metadata can prevent PID-to-track setup, after which filters/mux_isom.c accesses a member through a NULL TrackWriter pointer. Exploitation requires MP4Box to perform DASH segmentation on the supplied file; the bounded consequence is a process crash without reported data access or modification.

CVSS severity5.5
Medium
EPSS probability0.24%
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 GPAC MP4Box 2.4 allows attackers to crash the process via a crafted MP4 during DASH segmentation. Malformed mvcC or stsz metadata can prevent PID-to-track setup, after which filters/mux_isom.c accesses a member through a NULL TrackWriter pointer. Exploitation requires MP4Box to perform DASH segmentation on the supplied file; the bounded consequence is a process crash without reported data access or modification.

The record

CVE
CVE-2025-55643
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1204.002Malicious File

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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