CVE-2019-18978
MEDIUM5.3EPSS 0.78%The rack-cors rubygem may allow directory traveral
Published: 11/15/2019Modified: 4/28/2026
Description
An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.
Affected packages (5)
- Debian/ruby-rack-corsfrom 0, < 1.1.1-1
- Debian/ruby-rack-corsfrom 0, < 0.2.9-1+deb8u1
- Debian/ruby-rack-corsfrom 0, < 0.4.0-1+deb9u2
- Debian/ruby-rack-corsfrom 0, < 1.0.2-1+deb10u1
- RubyGems/rack-corsfrom 0, < 1.0.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
References (9)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2019-18978
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2019-18978
- PATCHhttps://github.com/cyu/rack-cors
- WEBhttps://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d
- WEBhttps://github.com/cyu/rack-cors/compare/v1.0.3...v1.0.4
- WEBhttps://lists.debian.org/debian-lts-announce/2020/02/msg00004.html
- WEBhttps://lists.debian.org/debian-lts-announce/2020/10/msg00000.html
- WEBhttps://usn.ubuntu.com/4571-1
- WEBhttps://www.debian.org/security/2021/dsa-4918