Uwe Ohse lrzsz up to 0.12.9 lrz receive utility pipe mode src/lrz.c procheader os command injection

Summaryinfo

A vulnerability was found in Uwe Ohse lrzsz up to 0.12.9. It has been declared as critical. This impacts the function procheader of the file src/lrz.c of the component lrz receive utility pipe mode. Executing a manipulation can lead to os command injection. This vulnerability is registered as CVE-2026-105841. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Uwe Ohse lrzsz up to 0.12.9. This vulnerability affects the function procheader of the file src/lrz.c of the component lrz receive utility pipe mode. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at ohse.de. This vulnerability was named CVE-2026-105841 since 10/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 0.13.0 eliminates this vulnerability.

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Productinfo

Vendor

• Uwe Ohse

Name

• lrzsz

Version

• 0.12.0
• 0.12.1
• 0.12.2
• 0.12.3
• 0.12.4
• 0.12.5
• 0.12.6
• 0.12.7
• 0.12.8
• 0.12.9

CPE 2.3info

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CPE 2.2info

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