Path traversal in Servor lets unauthenticated attackers read files
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.
Summary
Servor from lukejacksonn, versions 1.0.0 through 4.0.2, contains a path traversal flaw (CWE-22). The code decodes URL-encoded dot segments before joining paths, so requests can escape the served root. An unauthenticated remote attacker can read arbitrary files and list directories outside that root.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 |
|---|---|---|---|---|---|
| lukejacksonn | servor | 1.0.0 – 4.0.2 | — | No fix listed | CNA |
- servor Vendorlukejacksonn Affected 1.0.0 – 4.0.2 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Servor.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Timeline
- 2026-10-12 Threatist record created from CVE-2021-48011
- 2026-10-13 Alias added: GHSA-pcvv-rm69-6cv3
- 2026-10-13 CISA SSVC decision points changed
References
Sources
- CVE-2021-48011 · CVE Program
- CVE-2021-48011 · NVD
- FIRST EPSS
- GHSA-pcvv-rm69-6cv3 · GitHub Advisory Database · CC BY 4.0
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