Answer in brief
CVE-2019-1020001 records a High severity (CVSS 7.5) vulnerability in Path Traversal vulnerability that affects yard. The current sources do not mark it as known exploited. The current feed maps yard (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps yard (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| yardrubygems | >=0 <0.9.20 | 0.9.20 |
Published upstream
Jul 2, 2019
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
## Possible arbitrary path traversal and file access via `yard server` ### Impact A path traversal vulnerability was discovered in YARD <= 0.9.19 when using `yard server` to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. Thanks to CuongMX from Viettel Cyber Security for discovering this vulnerability. ### Patches Please upgrade to YARD v0.9.20 immediately if you are relying on yard server to host documentation in any untrusted environments. ### Workarounds For users who cannot upgrade, it is possible to perform path sanitization of HTTP requests at your webserver level. WEBrick, for example, can perform such sanitization by default (which you can use via `yard server -s webrick`), as can certain rules in your webserver configuration.
Quoted source text, attributed separately from HOL analysis.