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CVE-2026-35345— uutils coreutils tail Privileged Information Disclosure via Symlink Replacement Race

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存在后置链接漏洞，该漏洞源于tail实用程序在使用--follow=name选项时可能泄露敏感文件内容，与GNU tail不同，uutils实现在路径被符号链接替换后继续监视该路径，随后输出链接目标的内容，在特权用户监视日志目录的环境中，具有该目录写入权限的本地攻击者可将日志文件替换为指向敏感系统文件的符号链接，导致tail泄露敏感文件内容。

CVSS 5.3 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-35345

Vulnerability Information
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Vulnerability Title
uutils coreutils tail Privileged Information Disclosure via Symlink Replacement Race
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the tail utility of uutils coreutils allows for the exfiltration of sensitive file contents when using the --follow=name option. Unlike GNU tail, the uutils implementation continues to monitor a path after it has been replaced by a symbolic link, subsequently outputting the contents of the link's target. In environments where a privileged user (e.g., root) monitors a log directory, a local attacker with write access to that directory can replace a log file with a symlink to a sensitive system file (such as /etc/shadow), causing tail to disclose the contents of the sensitive file.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
uutils coreutils 后置链接漏洞
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存在后置链接漏洞，该漏洞源于tail实用程序在使用--follow=name选项时可能泄露敏感文件内容，与GNU tail不同，uutils实现在路径被符号链接替换后继续监视该路径，随后输出链接目标的内容，在特权用户监视日志目录的环境中，具有该目录写入权限的本地攻击者可将日志文件替换为指向敏感系统文件的符号链接，导致tail泄露敏感文件内容。
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 - -

II. Public POCs for CVE-2026-35345

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III. Intelligence Information for CVE-2026-35345

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Other References for CVE-2026-35345 (1)

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-2026-35374 6.3 MEDIUM uutils coreutils split Arbitrary File Truncation via Time-of-Check to Time-of-Use (TOCTOU)
CVE-2026-35364 6.3 MEDIUM uutils coreutils mv Arbitrary File Overwrite via Cross-Device TOCTOU Race Condition
CVE-2026-35356 6.3 MEDIUM uutils coreutils install Arbitrary File Overwrite with -D via Path Component Symlink Race
CVE-2026-35355 6.3 MEDIUM uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU Race
CVE-2026-35363 5.6 MEDIUM uutils coreutils rm Safeguard Bypass via Improper Path Normalization
CVE-2026-35369 5.5 MEDIUM uutils coreutils kill System-wide Process Termination and Denial of Service via Argument M
CVE-2026-35340 5.5 MEDIUM uutils coreutils chown and chgrp False Success Exit Code in Recursive Mode
CVE-2026-35348 5.5 MEDIUM uutils coreutils sort Local Denial of Service via Forced UTF-8 Parsing
CVE-2026-35380 5.5 MEDIUM uutils coreutils cut Local Logic Error and Data Integrity Issue in Delimiter Parsing
CVE-2026-35339 5.5 MEDIUM uutils coreutils chmod False Success Exit Code in Recursive Mode
CVE-2026-35372 5.0 MEDIUM uutils coreutils ln Security Bypass via Improper Handling of the --no-dereference Flag
CVE-2026-35357 4.7 MEDIUM uutils coreutils cp Information Disclosure via Permission Handling Race

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

IV. Related Vulnerabilities

Same product: coreutils
Same vendor: Uutils
Same weakness: CWE-367

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