UBUNTU-CVE-2026-48990

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Source

https://ubuntu.com/security/CVE-2026-48990

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48990.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48990

Upstream

CVE-2026-48990

Published

2026-06-17T22:16:00Z

Modified

2026-06-24T11:01:41.863968561Z

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

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In versions 1.3.4 through 1.6.5, joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.maxpayloadlength, which can lead to resource exhaustion. The normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than JWSRegistry.maxpayloadlength. Applications that accept lower-trust JWS values and rely on joserfc to reject oversized token content during verification have a moderate availability risk. This issue has been fixed in version 1.6.7.

References

Affected packages

Ubuntu:25.10 / joserfc

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.4-1

1.1.0-1

1.2.0-1

1.2.2-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-joserfc",
            "binary_version": "1.2.2-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48990.json"

Ubuntu:26.04:LTS / joserfc

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.2.2-1

1.4.0-1

1.4.1-1

1.4.3-1

1.5.0-1

1.6.2-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-joserfc",
            "binary_version": "1.6.2-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48990.json"