Is CVE-2026-105840 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-105840?

CVE-2026-105840 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-105840

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.