UBUNTU-CVE-2026-33996

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Source
https://ubuntu.com/security/CVE-2026-33996
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33996
Upstream
Published
2026-03-27T23:17:00Z
Modified
2026-04-27T19:03:14.400658Z
Severity
  • 5.8 (Medium) CVSS_V4 - CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:A/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

LibJWT is a C JSON Web Token Library. Starting in version 3.0.0 and prior to version 3.3.0, the JWK parsing for RSA-PSS did not protect against a NULL value when expecting to parse JSON string values. A specially crafted JWK file could exploit this behavior by using integers in places where the code expected a string. This was fixed in v3.3.0. A workaround is available. Users importing keys through a JWK file should not do so from untrusted sources. Use the jwk2key tool to check for validity of a JWK file. Likewise, if possible, do not use JWK files with RSA-PSS keys.

References

Affected packages

Ubuntu:18.04:LTS
libjwt

Package

Name
libjwt
Purl
pkg:deb/ubuntu/libjwt@1.9.0-1build1?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.8.0+dfsg-1
1.8.0+dfsg-2
1.9.0-1
1.9.0-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjwt0",
            "binary_version": "1.9.0-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"
Ubuntu:20.04:LTS
libjwt

Package

Name
libjwt
Purl
pkg:deb/ubuntu/libjwt@1.10.2-1?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.10.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjwt-gnutls0",
            "binary_version": "1.10.2-1"
        },
        {
            "binary_name": "libjwt0",
            "binary_version": "1.10.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"
Ubuntu:22.04:LTS
libjwt

Package

Name
libjwt
Purl
pkg:deb/ubuntu/libjwt@1.10.2-1build1?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.10.2-1
1.10.2-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjwt-gnutls0",
            "binary_version": "1.10.2-1build1"
        },
        {
            "binary_name": "libjwt0",
            "binary_version": "1.10.2-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"
Ubuntu:24.04:LTS
libjwt

Package

Name
libjwt
Purl
pkg:deb/ubuntu/libjwt@1.17.0-2build2?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.10.2-1build1
1.17.0-2
1.17.0-2build1
1.17.0-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjwt-gnutls2",
            "binary_version": "1.17.0-2build2"
        },
        {
            "binary_name": "libjwt2",
            "binary_version": "1.17.0-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"
Ubuntu:25.10
libjwt

Package

Name
libjwt
Purl
pkg:deb/ubuntu/libjwt@1.17.2-1?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.17.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjwt-gnutls2",
            "binary_version": "1.17.2-1"
        },
        {
            "binary_name": "libjwt2",
            "binary_version": "1.17.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"
Ubuntu:26.04
libjwt

Package

Name
libjwt
Purl
pkg:deb/ubuntu/libjwt@1.17.2-1build1?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.17.2-1
1.17.2-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjwt-gnutls2",
            "binary_version": "1.17.2-1build1"
        },
        {
            "binary_name": "libjwt2",
            "binary_version": "1.17.2-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"
libjwt3

Package

Name
libjwt3
Purl
pkg:deb/ubuntu/libjwt3@3.2.3-1?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.2.2-1
3.2.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jwt-tools",
            "binary_version": "3.2.3-1"
        },
        {
            "binary_name": "libjwt14",
            "binary_version": "3.2.3-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33996.json"