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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-06 · updated 2026-10-09
Weakness: CWE-22

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.

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

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