TI-2026-38771 Aliases CVE-2026-53765 GHSA-3pvj-jv98-qhjq

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

LOW 26CWE-59Published 2026-06-24 · Updated 2026-06-26

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00104 1st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed chrome-devtools-mcp (ChromeDevTools): 1.1.0chrome-devtools-mcp (npm): 1.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ChromeDevTools	chrome-devtools-mcp	0.20.0 to before 1.1.0	1.1.0	Patch available	CNA
—	chrome-devtools-mcp (npm)	0.20.0 to before 1.1.0	1.1.0	Patch available	GHSA-3pvj-jv98-qhjq

chrome-devtools-mcp VendorChromeDevTools Affected 0.20.0 to before 1.1.0 Fixed in 1.1.0 Patch available CNA
chrome-devtools-mcp (npm) Vendor— Affected 0.20.0 to before 1.1.0 Fixed in 1.1.0 Patch available GHSA-3pvj-jv98-qhjq

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:google:chrome-devtools-mcp::::::node.js::*	0.20.0 to before 1.1.0	Vulnerable	Google

cpe:2.3:a:google:chrome-devtools-mcp:*:*:*:*:*:node.js:*:* Versions 0.20.0 to before 1.1.0 Vulnerable ·Google

Remediation

Fix · CNA chrome-devtools-mcp (ChromeDevTools) Fixed in 1.1.0
Fix · GHSA-3pvj-jv98-qhjq chrome-devtools-mcp (npm) Fixed in 1.1.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-53765
2026-10-03 Alias added: GHSA-3pvj-jv98-qhjq

References

TI-2026-38772 chrome-devtools-mcp: validatePath() does not canonicalize symlinks before enforcing roots CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences