Sinatra Path Traversal vulnerability

published 2018-02-18 8 y ago modified 2026-06-17 4 mo ago also GHSA-h29f-7f56-j8wh , EUVD-2018-0167

cvss: 5.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits: 0; none known

An issue was discovered in rack-protection/lib/rack/protection/path_traversal.rb in Sinatra 2.x before 2.0.1 on Windows. Path traversal is possible via backslash characters.

Patch / fix

fixed in 1 links 2

rubygems sinatra 2.0.1

github.com/sinatra/sinatra@6ad721a commit
github.com/sinatra/sinatra#1379 pull request

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-7212 updated 2026-11-07 cvss 5.3

rubygem-sinatra: path traversal via backslash characters

Red Hat Enterprise Linux 6 pcs Red Hat Enterprise Linux 7 pcs, pcs-snmp, python-clufter Red Hat OpenStack Platform 10 (Newton) Operational Tools rubygem-sinatra Red Hat Satellite 6 rubygem-sinatra, tfm-ror51-rubygem-sinatra Red Hat Software Collections rh-ror50-rubygem-sinatra Red Hat Storage 3 rubygem-sinatra
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.84% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
rubygems	sinatra	>=2.0.0.beta1, <2.0.1	2.0.1

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

github.com /sinatra/sinatra/commit/6ad721abcfe36334108dcdd05d046c361e1b7a9c
web, third-party-advisory
github.com /sinatra/sinatra/pull/1379
web, issue-tracking, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2018-7212
advisory
github.com /sinatra/sinatra
package

Sources

CVE List CVE-2018-7212
GitHub Advisory GHSA-h29f-7f56-j8wh
NVD CVE-2018-7212

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary