UBUNTU-CVE-2026-48524

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Source

https://ubuntu.com/security/CVE-2026-48524

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48524

Upstream

CVE-2026-48524

Published

2026-05-28T16:16:00Z

Modified

2026-06-03T11:26:16Z

Severity

3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient.getsigningkey() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests. The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. This vulnerability is fixed in 2.13.0.

References

Affected packages

Ubuntu:22.04:LTS

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.7.1-2ubuntu2

2.*

2.1.0-1

2.3.0-1

2.3.0-1ubuntu0.1

2.3.0-1ubuntu0.2

2.3.0-1ubuntu0.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-jwt",
            "binary_version": "2.3.0-1ubuntu0.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"

Ubuntu:24.04:LTS

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.7.0-1

2.7.0-1ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-jwt",
            "binary_version": "2.7.0-1ubuntu0.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"

Ubuntu:25.10

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.10.1-2

2.10.1-2ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-jwt",
            "binary_version": "2.10.1-2ubuntu0.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"

Ubuntu:26.04:LTS

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.10.1-2

2.10.1-3

2.10.1-3build1

2.10.1-4

2.10.1-4ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-jwt",
            "binary_version": "2.10.1-4ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"

Ubuntu:Pro:16.04:LTS

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.0-0ubuntu1

1.3.0-1

1.3.0-1ubuntu0.1

1.3.0-1ubuntu0.1+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python-jwt",
            "binary_version": "1.3.0-1ubuntu0.1+esm1"
        },
        {
            "binary_name": "python3-jwt",
            "binary_version": "1.3.0-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"

Ubuntu:Pro:18.04:LTS

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.2-1.1

1.5.3+ds1-1

1.5.3+ds1-1ubuntu0.1

1.5.3+ds1-1ubuntu0.1+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python-jwt",
            "binary_version": "1.5.3+ds1-1ubuntu0.1+esm1"
        },
        {
            "binary_name": "python3-jwt",
            "binary_version": "1.5.3+ds1-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"

Ubuntu:Pro:20.04:LTS

pyjwt

Package

Name: pyjwt
Purl: pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.7.0-2

1.7.1-1

1.7.1-2ubuntu1

1.7.1-2ubuntu2

1.7.1-2ubuntu2.1

1.7.1-2ubuntu2.1+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-jwt",
            "binary_version": "1.7.1-2ubuntu2.1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48524.json"