Vulnerability in Uwe Ohse lrzsz

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3978

  Red Hat Enterprise Linux (lrzsz): Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-105840CVE-2026-105841

[ References ]References

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