CVE-2025-55664Public exploit

Application crash via unchecked subtitle payload length

Published Jun 1, 2026 · Updated Jun 1, 2026

Heap buffer overflow in GPAC MP4Box 2.4 allows attackers to crash the application by processing a crafted MPEG-2 TS file. The m2tsdmx_send_packet function subtracts two bytes from an unchecked DVB subtitle payload length, causing unsigned wraparound and a memcpy of 4,294,967,295 bytes beyond a 183-byte heap allocation. Exploitation requires user interaction to make MP4Box process the malicious file, and published evidence demonstrates a crash rather than code execution.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in GPAC MP4Box 2.4 allows attackers to crash the application by processing a crafted MPEG-2 TS file. The m2tsdmx_send_packet function subtracts two bytes from an unchecked DVB subtitle payload length, causing unsigned wraparound and a memcpy of 4,294,967,295 bytes beyond a 183-byte heap allocation. Exploitation requires user interaction to make MP4Box process the malicious file, and published evidence demonstrates a crash rather than code execution.

The record

CVE
CVE-2025-55664
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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 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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
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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