UBUNTU-CVE-2026-45363

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Source
https://ubuntu.com/security/CVE-2026-45363
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-45363
Upstream
Published
2026-07-14T22:16:00Z
Modified
2026-07-15T19:47:11.815380448Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

ruby-jwt is a Ruby implementation of the RFC 7519 OAuth JSON Web Token standard. Prior to 2.10.3 and 3.2.0, JWT.decode(token, '', true, algorithm: 'HS256') accepts an attacker-forged token because OpenSSL::HMAC.digest('SHA256', '', payload) returns a valid digest under an empty key and no empty-key precondition exists in the HMAC algorithm. The same path is reached when a keyfinder block or keyfinder: argument returns an empty string, nil, or an array containing nil for an unknown key, affecting HS256, HS384, and HS512 verification through JWT.decode and JWT::EncodedToken#verifysignature!. This issue is fixed in versions 2.10.3 and 3.2.0.

References

Affected packages

Ubuntu:16.04:LTS
ruby-jwt

Package

Name
ruby-jwt
Purl
pkg:deb/ubuntu/ruby-jwt?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.0-3",
            "binary_name": "ruby-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json"
Ubuntu:18.04:LTS
ruby-jwt

Package

Name
ruby-jwt
Purl
pkg:deb/ubuntu/ruby-jwt?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.5.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.5.6-1",
            "binary_name": "ruby-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json"
Ubuntu:20.04:LTS
ruby-jwt

Package

Name
ruby-jwt
Purl
pkg:deb/ubuntu/ruby-jwt?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.5.6-1
2.*
2.1.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.0-2",
            "binary_name": "ruby-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json"
Ubuntu:22.04:LTS
ruby-jwt

Package

Name
ruby-jwt
Purl
pkg:deb/ubuntu/ruby-jwt?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.2.2-1",
            "binary_name": "ruby-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json"
Ubuntu:24.04:LTS
ruby-jwt

Package

Name
ruby-jwt
Purl
pkg:deb/ubuntu/ruby-jwt?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.7.0-2
2.7.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.7.1-1",
            "binary_name": "ruby-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json"
Ubuntu:26.04:LTS
ruby-jwt

Package

Name
ruby-jwt
Purl
pkg:deb/ubuntu/ruby-jwt?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.7.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.7.1-1",
            "binary_name": "ruby-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45363.json"