RLSA-2026:98481: Important: lrzsz security, bug fix, and enhancement update

Q: Which lrzsz operating modes are affected by the security fixes?

The update addresses an arbitrary file overwrite issue in restricted mode and an arbitrary command execution issue in pipe mode.

Q: What would an attacker need to do to exploit these issues?

For the file overwrite issue, exploitation involves absolute path traversal in restricted mode. For the command execution issue, exploitation involves crafted file names in pipe mode.

Q: What is the potential impact if exploitation succeeds?

The restricted-mode issue can allow arbitrary file overwrite, while the pipe-mode issue can allow arbitrary command execution. The advisory rates the update as high severity with a 7.5 CVSS score.

Published Nov 12, 2026

Updated

Lrzsz (consisting of lrz and lsz) is a cosmetically modified zmodem/ymodem/xmodem package built from the public-domain version of the rzsz package. Lrzsz was created to provide a working GNU copylefted Zmodem solution for Linux systems.

Security Fix(es):

lrzsz: lrzsz: Arbitrary file overwrite via absolute path traversal in restricted mode (CVE-2026-105840)

lrzsz: lrzsz: Arbitrary command execution via crafted file names in pipe mode (CVE-2026-105841)

Bug Fix(es) and Enhancement(s):

lrzsz: segfault with -s [rhel-9.9.z] (JIRA:Rocky Linux-282118)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected Software

1 affected componentFixes available

rocky-linux/lrzsz<0:0.12.20-58.el9_8

0:0.12.20-58.el9_8

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade rocky-linux/lrzsz to a version that resolves this vulnerability.
Fixed in 0:0.12.20-58.el9_8

Event History

Nov 12, 2026

Advisory Published

via OSV·12:04 AM

Data Sourced

via OSV·12:04 AM

DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

Which lrzsz operating modes are affected by the security fixes?

The update addresses an arbitrary file overwrite issue in restricted mode and an arbitrary command execution issue in pipe mode.

What would an attacker need to do to exploit these issues?

For the file overwrite issue, exploitation involves absolute path traversal in restricted mode. For the command execution issue, exploitation involves crafted file names in pipe mode.

What is the potential impact if exploitation succeeds?

The restricted-mode issue can allow arbitrary file overwrite, while the pipe-mode issue can allow arbitrary command execution. The advisory rates the update as high severity with a 7.5 CVSS score.

RLSA-2026:98481: Important: lrzsz security, bug fix, and enhancement update

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

Which lrzsz operating modes are affected by the security fixes?

What would an attacker need to do to exploit these issues?

What is the potential impact if exploitation succeeds?

Company

Resources

Contact

Frequently Asked Questions

Which lrzsz operating modes are affected by the security fixes?

What would an attacker need to do to exploit these issues?

What is the potential impact if exploitation succeeds?