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CVE-2026-105842— lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname

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（lrz）的 procheader() 函数存在一个基于堆的缓冲区溢出漏洞。当将发送方提供的过长文件名复制到 Pathname 时，就会触发该漏洞。恶意的 ZMODEM 发送方可以构造长达 8192 字节的文件名，通过在管道模式下调用 sprintf() 或使用 strcpy() 导致缓冲区溢出，从而破坏堆内存并导致 lrz 崩溃。

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-105842

Vulnerability Information
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Vulnerability Title
lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname
Source: CVE Program / CVE List V5
Vulnerability Description
lrzsz before 0.13.0 contains a heap-based buffer overflow vulnerability in procheader() of the lrz receive utility when copying overlong sender-supplied filenames into Pathname. Malicious ZMODEM senders can supply filenames up to 8192 bytes, overflowing the buffer via sprintf() in pipe mode or strcpy() to corrupt heap memory and crash lrz.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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-2026-105842

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III. Intelligence Information for CVE-2026-105842

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Other References for CVE-2026-105842 (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-2026-105840 7.5 HIGH lrzsz before 0.13.0 Path Traversal via lrz Restricted Mode checkpath()

IV. Related Vulnerabilities

Same product: lrzsz
Same vendor: Uwe Ohse
Same weakness: CWE-122

V. Comments for CVE-2026-105842

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