Vulnerability in Uwe Ohse lrzsz

[ Description ]Official 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.

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