Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2021-48011Servor 1.0.0 through 4.0.2 Unauthenticated Path Traversal via URL-Encoded Dot Segments
High 7.5
In plain English
A high-severity path traversal in servor from lukejacksonn. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 53.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Servor 1.0.0 through 4.0.2 contains a path traversal vulnerability that allows unauthenticated remote attackers to escape the served root by sending URL-encoded dot segments. Attackers can send %2e%2e/ sequences, which decodeURI() decodes before path.join() in serveStaticFile and serveDirectoryListing, to read arbitrary files and list directories outside the root.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| lukejacksonn | servor | 1.0.0 – through 4.0.2 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Pull Request #70 issue-tracking, patch
- Patch Commit patch
- https://github.com/lukejacksonn/servor product
- VulnCheck Advisory: Servor 1.0.0 through 4.0.2 Unauthenticated Path Traversal via URL-Encoded Dot Segments third-party-advisory