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CVE-2026-105840— lrzsz before 0.13.0 Path Traversal via lrz Restricted Mode checkpath()

Quick assessment

Affected
Uwe Ohse lrzsz
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 lrzsz 0.13.0 之前的版本中，lrz 接收工具的限制模式存在路径遍历漏洞。该漏洞允许恶意的 ZMODEM 发送方使用绝对路径名将文件写入当前目录之外。由于 中的 函数在未通过 选项构建的情况下，仅会拒绝包含 序列的路径，攻击者可以使用绝对路径命名文件，从而覆盖接收用户有权写入的任何文件。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-105840

Vulnerability Information
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Vulnerability Title
lrzsz before 0.13.0 Path Traversal via lrz Restricted Mode checkpath()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Uwe Ohse lrzsz 0 ~ 0.13.0 -

II. Public POCs for CVE-2026-105840

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III. Intelligence Information for CVE-2026-105840

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Other References for CVE-2026-105840 (3)

Same Patch Batch · Uwe Ohse · 2026-10-06 · 3 CVEs total

CVE-2026-105841 7.5 HIGH lrzsz before 0.13.0 OS Command Injection via lrz Pipe Mode
CVE-2026-105842 6.4 MEDIUM lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname

IV. Related Vulnerabilities

Same product: lrzsz
Same vendor: Uwe Ohse
Same weakness: CWE-22

V. Comments for CVE-2026-105840

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