CVE-2026-35355— uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU 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存在安全漏洞，该漏洞源于install文件安装期间存在竞争条件，可能导致本地攻击者通过符号链接重定向特权写入，覆盖任意系统文件。
Possible ATT&CK Techniques 1 AI
T1548.001 · Setuid and Setgid
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I. Basic Information for CVE-2026-35355
Vulnerability Information
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Vulnerability Title
uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU Race
Source: CVE Program / CVE List V5
Vulnerability Description
The install utility in uutils coreutils is vulnerable to a Time-of-Check to Time-of-Use (TOCTOU) race condition during file installation. The implementation unlinks an existing destination file and then recreates it using a path-based operation without the O_EXCL flag. A local attacker can exploit the window between the unlink and the subsequent creation to swap the path with a symbolic link, allowing them to redirect privileged writes to overwrite arbitrary system files.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
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 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install文件安装期间存在竞争条件，可能导致本地攻击者通过符号链接重定向特权写入，覆盖任意系统文件。
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
II. Public POCs for CVE-2026-35355
| # | POC Description | Source Link | Shenlong Link |
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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-2026-35356 | 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-2026-35360 | 6.3 MEDIUM | uutils coreutils touch Arbitrary File Truncation via TOCTOU Race Condition |
| 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-2026-35369 | 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-2026-35340 | 5.5 MEDIUM | uutils coreutils chown and chgrp False Success Exit Code in Recursive Mode |
| CVE-2026-35339 | 5.5 MEDIUM | uutils coreutils chmod False Success Exit Code in Recursive Mode |
| CVE-2026-35380 | 5.5 MEDIUM | uutils coreutils cut Local Logic Error and Data Integrity Issue in Delimiter Parsing |
| 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 |
| CVE-2026-35359 | 4.7 MEDIUM | uutils coreutils cp Information Disclosure via Time-of-Check to Time-of-Use Symlink Swap |
Showing top 20 of 44 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: coreutils
-
CVE-2026-93658
uutils coreutils 0.0.18 before 0.10.0 Privilege Escalation v -
CVE-2026-56392
Heap-based Buffer Overflow in GNU coreutils -
CVE-2026-56391
Out‑of‑bounds Read in GNU coreutils -
CVE-2026-35381
uutils coreutils cut Local Logic Error and Data Integrity Is -
CVE-2026-35380
uutils coreutils cut Local Logic Error and Data Integrity Is
Same vendor: Uutils
-
CVE-2026-93658
uutils coreutils 0.0.18 before 0.10.0 Privilege Escalation v -
CVE-2026-35381
uutils coreutils cut Local Logic Error and Data Integrity Is -
CVE-2026-35380
uutils coreutils cut Local Logic Error and Data Integrity Is -
CVE-2026-35379
uutils coreutils tr Local Logic Error and Data Integrity Iss -
CVE-2026-35378
uutils coreutils expr Local Denial of Service via Eager Eval
Same weakness: CWE-367
V. Comments for CVE-2026-35355
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