Read the docs
TI-2025-43924 Aliases CVE-2025-55640GHSA-9g23-86wf-5x87

GPAC MP4Box heap buffer overflow in stbl_AddSize allows DoS via crafted file

Priority MEDIUM 58CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 lets an attacker cause a Denial of Service (DoS) by supplying a crafted MP4 file (CWE-122, Heap-based Buffer Overflow). The CNA scored it 5.5 (MEDIUM) under CVSS 3.1: local attack, user interaction required, high availability impact, no confidentiality or integrity impact. CISA's SSVC data shows proof-of-concept exploitation, no automatable path and partial technical impact, and CISA KEV does not list it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00195 9th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

No fixed version is listed for GPAC MP4Box. Do not open untrusted MP4 files with MP4Box v2.4 until a fix is available, and check the GPAC project and the advisory GHSA-9g23-86wf-5x87 for updates.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-16 Threatist record created from CVE-2025-55640
  2. 2026-10-18 Alias added: GHSA-9g23-86wf-5x87
  3. 2026-10-26 CVSS score added · CISA ADP
  4. 2026-10-26 Weakness changed · CISA ADP
  5. 2026-10-26 CISA SSVC decision points changed
  6. 2026-10-26 Priority changed: LOW → MEDIUM

References

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences