CVE-2025-55639Public exploitNetwork attack vector

Process crash via null track-kind duplication

Published Jun 23, 2026 · Updated Jun 23, 2026

NULL pointer dereference in GPAC MP4Box 2.4 allows attackers to crash the process by importing a crafted MPEG-H Audio MP4 file. gf_isom_add_track_kind passes a null kind value derived during MPEG-H track import to strdup without first rejecting it, causing a zero-page read and segmentation fault. The crash requires MP4Box to import the malicious file; no confidentiality or integrity impact is reported.

CVSS severity6.5
Medium
EPSS probability0.51%
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 by importing a crafted MPEG-H Audio MP4 file. gf_isom_add_track_kind passes a null kind value derived during MPEG-H track import to strdup without first rejecting it, causing a zero-page read and segmentation fault. The crash requires MP4Box to import the malicious file; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2025-55639
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 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

6.5CISA-ADPCVSS:3.1/AV:N/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 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

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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