UBUNTU-CVE-2026-48525

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Source
https://ubuntu.com/security/CVE-2026-48525
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48525
Upstream
  • CVE-2026-48525
Published
2026-05-28T16:16:00Z
Modified
2026-06-03T11:26:16Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/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. From 2.8.0 to 2.12.1, when verifying detached JWS tokens using the unencoded-payload option ("b64": false, RFC 7797), PyJWT performs Base64URL decoding of the compact-serialization payload segment before enforcing the detached-payload rules. For b64=false, PyJWT later discards that decoded payload and replaces it with the caller-provided detached_payload. In practice, this turns the middle segment into an attacker-controlled “work amplifier”: a remote client can supply an arbitrarily large Base64URL payload segment that forces CPU work + memory allocations even if the signature is invalid. This creates an unauthenticated DoS vector against any endpoint that verifies detached JWS using PyJWT. 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_version": "2.3.0-1ubuntu0.3",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.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_version": "2.7.0-1ubuntu0.1",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.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_version": "2.10.1-2ubuntu0.1",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.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_version": "2.10.1-4ubuntu1",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.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_version": "1.3.0-1ubuntu0.1+esm1",
            "binary_name": "python-jwt"
        },
        {
            "binary_version": "1.3.0-1ubuntu0.1+esm1",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.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_version": "1.5.3+ds1-1ubuntu0.1+esm1",
            "binary_name": "python-jwt"
        },
        {
            "binary_version": "1.5.3+ds1-1ubuntu0.1+esm1",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.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_version": "1.7.1-2ubuntu2.1+esm1",
            "binary_name": "python3-jwt"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48525.json"