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CVE-2026-35342— uutils coreutils mktemp Insecure Temporary File Placement via Empty TMPDIR

Quick assessment

Affected
Uutils coreutils
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.

uutils coreutils是Uutils开源的一个跨平台核心命令行工具集。 uutils coreutils存在安全漏洞，该漏洞源于mktemp实用程序未能正确处理空的TMPDIR环境变量，与GNU mktemp在TMPDIR为空字符串时回退到/tmp不同，uutils实现将空字符串视为有效路径，导致临时文件在当前工作目录中创建，如果CWD比/tmp更宽松或可被其他用户访问，可能导致意外信息泄露或未经授权访问临时数据。

CVSS 3.3 · Low EPSS 0.13% · P3
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I. Basic Information for CVE-2026-35342

Vulnerability Information
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Vulnerability Title
uutils coreutils mktemp Insecure Temporary File Placement via Empty TMPDIR
Source: CVE Program / CVE List V5
Vulnerability Description
The mktemp utility in uutils coreutils fails to properly handle an empty TMPDIR environment variable. Unlike GNU mktemp, which falls back to /tmp when TMPDIR is an empty string, the uutils implementation treats the empty string as a valid path. This causes temporary files to be created in the current working directory (CWD) instead of the intended secure temporary directory. If the CWD is more permissive or accessible to other users than /tmp, it may lead to unintended information disclosure or unauthorized access to temporary data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不安全的临时文件
Source: CVE Program / CVE List V5
Vulnerability Title
uutils coreutils 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
uutils coreutils是Uutils开源的一个跨平台核心命令行工具集。 uutils coreutils存在安全漏洞，该漏洞源于mktemp实用程序未能正确处理空的TMPDIR环境变量，与GNU mktemp在TMPDIR为空字符串时回退到/tmp不同，uutils实现将空字符串视为有效路径，导致临时文件在当前工作目录中创建，如果CWD比/tmp更宽松或可被其他用户访问，可能导致意外信息泄露或未经授权访问临时数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Uutils coreutils 0 ~ 0.6.0 -

II. Public POCs for CVE-2026-35342

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III. Intelligence Information for CVE-2026-35342

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Same Patch Batch · Uutils · 2026-04-22 · 44 CVEs total

CVE-2026-35338 7.3 HIGH uutils coreutils chmod Path Traversal Bypass of --preserve-root
CVE-2026-35368 7.2 HIGH uutils coreutils chroot Local Privilege Escalation and chroot Escape in via Name Service S
CVE-2026-35341 7.1 HIGH uutils coreutils mkfifo Unauthorized Permission Change on Existing Files
CVE-2026-35352 7.0 HIGH uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition
CVE-2026-35349 6.7 MEDIUM uutils coreutils Path-Based Safety Bypass with --preserve-root
CVE-2026-35350 6.6 MEDIUM uutils coreutils cp Unexpected Privileged Executable Creation with -p
CVE-2026-35365 6.6 MEDIUM uutils coreutils mv Denial of Service and Data Duplication via Improper Symlink Expansion
CVE-2026-35360 6.3 MEDIUM uutils coreutils touch Arbitrary File Truncation via TOCTOU Race Condition
CVE-2026-35356 6.3 MEDIUM uutils coreutils install Arbitrary File Overwrite with -D via Path Component Symlink Race
CVE-2026-35374 6.3 MEDIUM uutils coreutils split Arbitrary File Truncation via Time-of-Check to Time-of-Use (TOCTOU)
CVE-2026-35355 6.3 MEDIUM uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU Race
CVE-2026-35364 6.3 MEDIUM uutils coreutils mv Arbitrary File Overwrite via Cross-Device TOCTOU Race Condition
CVE-2026-35363 5.6 MEDIUM uutils coreutils rm Safeguard Bypass via Improper Path Normalization
CVE-2026-35380 5.5 MEDIUM uutils coreutils cut Local Logic Error and Data Integrity Issue in Delimiter Parsing
CVE-2026-35369 5.5 MEDIUM uutils coreutils kill System-wide Process Termination and Denial of Service via Argument M
CVE-2026-35348 5.5 MEDIUM uutils coreutils sort Local Denial of Service via Forced UTF-8 Parsing
CVE-2026-35339 5.5 MEDIUM uutils coreutils chmod False Success Exit Code in Recursive Mode
CVE-2026-35340 5.5 MEDIUM uutils coreutils chown and chgrp False Success Exit Code in Recursive Mode
CVE-2026-35345 5.3 MEDIUM uutils coreutils tail Privileged Information Disclosure via Symlink Replacement Race
CVE-2026-35372 5.0 MEDIUM uutils coreutils ln Security Bypass via Improper Handling of the --no-dereference Flag

Showing top 20 of 44 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: coreutils
Same vendor: Uutils
Same weakness: CWE-377