CVE-2025-55659Public exploitNetwork attack vector

Process crash via null ctts entries pointer

Published Jun 9, 2026 · Updated Jun 9, 2026

NULL pointer dereference in GPAC MP4Box 2.4 allows attackers to crash the process by supplying a crafted, truncated MP4 file. During split or remux output, negative-timestamp range handling can leave the composition-time-to-sample entries pointer null, and ctts_box_write dereferences it while writing the final ctts box. Exploitation requires MP4Box to process the file and interrupts only that process; no data disclosure or modification is reported.

CVSS severity4.3
Medium
EPSS probability0.34%
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 supplying a crafted, truncated MP4 file. During split or remux output, negative-timestamp range handling can leave the composition-time-to-sample entries pointer null, and ctts_box_write dereferences it while writing the final ctts box. Exploitation requires MP4Box to process the file and interrupts only that process; no data disclosure or modification is reported.

The record

CVE
CVE-2025-55659
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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

6.5Debian OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3oss-security disclosureCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1204.002User Execution: Malicious 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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