CVE-2026-53765 json
chrome-devtools-mcp: daemon.pid write follows symlinks in /tmp fallback runtime directory
published 2026-06-17 4 mo ago modified 2026-10-25 14 d ago also GHSA-3pvj-jv98-qhjq , EUVD-2026-39105
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
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.
Patch / fix
- npm chrome-devtools-mcp 1.1.0
- google chrome-devtools-mcp 1.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.10% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-3pvj-jv98-qhjq referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | chrome-devtools-mcp | >=0.20.0, <1.1.0 |
1.1.0 |
Affected products
- ChromeDevTools chrome-devtools-mcp
Classification
- Weakness
-
- CWE-59 Improper Link Resolution Before File Access
References
-
github.com
/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-3pvj-jv98-qhjq
web, exploit, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-53765
advisory
-
github.com
/ChromeDevTools/chrome-devtools-mcp
package
Sources
- CVE List CVE-2026-53765
- GitHub Advisory GHSA-3pvj-jv98-qhjq
- NVD CVE-2026-53765
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