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CVE-2026-53765— chrome-devtools-mcp: daemon.pid write follows symlinks in /tmp fallback runtime directory

Quick assessment

Affected
ChromeDevTools chrome-devtools-mcp
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.

ChromeDevTools Chrome DevTools for agents是ChromeDevTools组织的一款Chrome开发工具软件。 ChromeDevTools Chrome DevTools for agents 0.20.0版本至1.1.0之前版本存在后置链接漏洞，该漏洞源于写入PID文件时未使用O_NOFOLLOW，可能导致本地低权限用户通过符号链接攻击截断目标文件。

CVSS 6.1 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1548.001 · Setuid and Setgid

Affected Version Matrix 1

VendorProduct Version RangeStatus
ChromeDevTools chrome-devtools-mcp >= 0.20.0, < 1.1.0 affected
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I. Basic Information for CVE-2026-53765

Vulnerability Information
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Vulnerability Title
chrome-devtools-mcp: daemon.pid write follows symlinks in /tmp fallback runtime directory
Source: CVE Program / CVE List V5
Vulnerability Description
Chrome DevTools for agents (chrome-devtools-mcp) lets your coding agent control and inspect a live Chrome browser. From 0.20.0 until 1.1.0, The chrome-devtools-mcp daemon writes its PID file with fs.writeFileSync() to a deterministic runtime path. On typical macOS environments, and on Linux sessions where $XDG_RUNTIME_DIR is unset, that runtime path falls back to /tmp/chrome-devtools-mcp-<uid>/daemon.pid. Because the write does not use O_NOFOLLOW, a local low-privilege user on the same POSIX host can pre-create /tmp/chrome-devtools-mcp-<victim_uid>/daemon.pid as a symlink to a file writable by the victim. When the victim later starts daemon mode, fs.writeFileSync() follows the symlink and truncates the target file to the daemon PID string. This vulnerability is fixed in 1.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
ChromeDevTools Chrome DevTools for agents 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ChromeDevTools Chrome DevTools for agents是ChromeDevTools组织的一款Chrome开发工具软件。 ChromeDevTools Chrome DevTools for agents 0.20.0版本至1.1.0之前版本存在后置链接漏洞，该漏洞源于写入PID文件时未使用O_NOFOLLOW，可能导致本地低权限用户通过符号链接攻击截断目标文件。
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

Vendor Product Affected Versions CPE Subscribe
ChromeDevTools chrome-devtools-mcp >= 0.20.0, < 1.1.0 -

II. Public POCs for CVE-2026-53765

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III. Intelligence Information for CVE-2026-53765

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Vendor Advisories for CVE-2026-53765 (1)

IV. Related Vulnerabilities

Same product: chrome-devtools-mcp
Same vendor: ChromeDevTools
Same weakness: CWE-59

V. Comments for CVE-2026-53765

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