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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-06 · updated 2026-10-06
Weakness: CWE-78

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.

Affected products

Uwe Ohse lrzsz: before 0.13.0 — fixed in 0.13.0

How to fix

Upgrade to a fixed version: Uwe Ohse lrzsz 0.13.0. Check the vendor advisory for mitigations.

References

https://ohse.de/uwe/software/lrzsz.html
https://ohse.de/uwe/software/lrzsz/NEWS-0.13.0.html
https://www.vulncheck.com/advisories/lrzsz-before-0.13.0-os-command-injection-via-lrz-pipe-mode

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