How severe is CVE-2025-67487?

No CVSS score has been assigned to CVE-2025-67487 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2025-67487?

CVE-2025-67487 affects the following packages: static-web-server (crates.io). Ecosystems affected: crates.io.

How do I fix CVE-2025-67487?

Update static-web-server to 2.40.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-67487 is resolved across your whole dependency graph.

How do I detect CVE-2025-67487 in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for static-web-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-67487 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2025-67487 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-67487 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-67487?

CVE-2025-67487 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 36th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-67487?

CVE-2025-67487 is classified as CWE-61 (CWE-61), CWE-59 (CWE-59). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-67487 published, and has it been updated?

CVE-2025-67487 was published on December 9, 2025 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀 crates.io

Not in CISA KEV

CVE-2025-67487 — static-web-server

Fix: static-web-server/static-web-server@308f0d2

CVE-2025-67487 is a CWE-61 vulnerability in static-web-server. A fix is available for static-web-server — see the affected versions and patch details below.

Static Web Server is vulnerable to symbolic link Path Traversal

Also known asGHSA-459f-x8vq-xjjm

Published

Dec 9, 2025

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-67487.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs36th percentile — riskier than 36% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🦀static-web-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Summary

Symbolic links (symlinks) could be used to access files or directories outside the intended web root folder.

Details

SWS generally does not prevent symlinks from escaping the web server’s root directory. Therefore, if a malicious actor gains access to the web server’s root directory, they could create symlinks to access other files outside the designated web root folder either by URL or via the directory listing.

PoC

Serve a directory (web root) with SWS.
Create a symlink inside the web root that points to a file outside the web root. e.g. ln -s escape.txt $HOME/.bashrc
Open http://localhost/escape.txt in your browser.
The file content will be served.

Impact

Any web server that runs with elevated privileges (e.g., root/administrator) and handles user-supplied file uploads is primarily impacted.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`static-web-server`	all versions	2.40.1`cargo update -p static-web-server --precise 2.40.1`

Affected Products

1 product · 1 configurations

Application

static web serverstatic-web-server

≤ 2.40.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for static-web-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update static-web-server to 2.40.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-67487 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Summary Symbolic links (_symlinks_) could be used to access files or directories outside the intended web root folder. ### Details SWS generally does not prevent symlinks from escaping the web server’s root directory. Therefore, if a malicious actor gains access to the web server’s root directory, they could create symlinks to access other files outside the designated web root folder either by URL or via the directory listing. ### PoC - Serve a directory (web root) with SWS. - Create a symlink inside the web root that points to a file outside the web root. e.g. `ln -s escape.txt $HO

O3 Security · Impact-Aware SCA

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