CVE-2022-29970: Sinatra Sinatra Does Not Validate Expanded Vulnerability

HIGH
Advisory Identifier: GHSA-qp49-3pvw-x4m5
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CVSS 7.5
CWE-426 CWE-22
Published
Advisory Summary

CVE-2022-29970 is a HIGH (CVSS 7.5) sinatra does not validate expanded vulnerability (CWE-426: Untrusted Search Path) affecting Sinatra libraries in the RubyGems ecosystem. The issue involves sinatra does not validate expanded path matches. Remediation is available by upgrading affected packages to version 2.2.0.

CVE-2022-29970 at a Glance

CVE Identifier CVE-2022-29970
GHSA Identifier GHSA-qp49-3pvw-x4m5
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-426: Untrusted Search Path
Affected Product Sinatra
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2022-29970

To remediate this vulnerability, upgrade all affected Sinatra dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

sinatra fixed: 2.2.0 
Upgrade sinatra to 2.2.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for sinatra

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-29970, inspect your project dependencies for Sinatra:

inspect dependencies for sinatra

Analyze the terminal output to locate any version of Sinatra in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-426: Untrusted Search Path, where the product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control. In Sinatra, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Sinatra before 2.2.0 does not validate that the expanded path matches public_dir when serving static files.

CVE-2022-29970 Affected Sinatra Versions

1 component(s)
Fixed Versions:
2.2.0
Product / Package Ecosystem Affected Versions Fixed Version
sinatra
gem/sinatra
RubyGems
< 2.2.0
2.2.0

References

NVD — CVE-2022-29970 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-29970
Sinatra Source Repository REPOSITORY
https://github.com/sinatra/sinatra/pull/1683
Sinatra Source Repository REPOSITORY
https://github.com/sinatra/sinatra/pull/1683/commits/462c3ca1db53ed3cfc394cf5948e9c948ad1c10e
Sinatra Source Repository REPOSITORY
https://github.com/skylightio/skylight-ruby/pull/294
Sinatra Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sinatra/CVE-2022-29970.yml
Sinatra Source Repository REPOSITORY
https://github.com/sinatra/sinatra
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/10/msg00034.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2024/09/msg00020.html

Frequently Asked Questions

What is CVE-2022-29970?
CVE-2022-29970 is a security vulnerability in Sinatra involving sinatra does not validate expanded path matches under CWE-426: Untrusted Search Path.
Which Sinatra versions are affected?
Affected versions include releases prior to 2.2.0 across affected packages: sinatra.
What version fixes CVE-2022-29970?
Upgrading to 2.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sinatra affected?
Yes, sinatra is affected in releases prior to 2.2.0. Upgrade your dependency to 2.2.0 or later.
What is the CVSS score of CVE-2022-29970?
CVE-2022-29970 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2022-29970?
CVE-2022-29970 is classified under CWE-426: Untrusted Search Path (The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control.).
How can I check RubyGems dependencies for CVE-2022-29970?
Run the dependency tree command: 'inspect dependencies for sinatra'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qp49-3pvw-x4m5",
  "modified" : "2025-11-04T19:36:42Z",
  "published" : "2022-05-03T00:00:43Z",
  "aliases" : [ "CVE-2022-29970" ],
  "summary" : "sinatra does not validate expanded path matches",
  "details" : "Sinatra before 2.2.0 does not validate that the expanded path matches public_dir when serving static files.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "sinatra"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-29970"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sinatra/sinatra/pull/1683"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sinatra/sinatra/pull/1683/commits/462c3ca1db53ed3cfc394cf5948e9c948ad1c10e"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/skylightio/skylight-ruby/pull/294"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sinatra/CVE-2022-29970.yml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sinatra/sinatra"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/10/msg00034.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2024/09/msg00020.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22", "CWE-426" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-05-03T20:59:50Z",
    "nvd_published_at" : "2022-05-02T05:15:00Z"
  }
}