CVE-2026-48990

Aliases:GHSA-wphv-vfrh-23q5PYSEC-2026-2530DEBIAN-CVE-2026-48990CGA-c4fp-v3m2-h6vfCGA-hm97-4rf5-v74hCGA-2p63-x8pq-xgxfCGA-fc52-qwjm-wg6f
Advisory lineage Upstream: 0 Downstream: 4
Deferred
Published: 17 Jun 2026, 21:08
Last modified:18 Jun 2026, 12:51

Vulnerability Summary

Overall Risk (default)
low
21/100
CVSS Score
5.3 MEDIUM
v3.1 (cve.org)
EPSS Score
0.16% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Jun 2026, 21:08
Published
Vulnerability first disclosed
18 Jun 2026, 12:51
Last Modified
Vulnerability information updated

Description

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.max_payload_length, 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.max_payload_length. 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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Trends

Current EPSS score: 0.16%• Percentile: 6%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • chainguard•airflow-3

    < 3.2.2-r9

  • chainguard•localstack

    < 4.14.0-r18

  • wolfi•airflow-3

    < 3.2.2-r9

  • authlib•joserfc

    < 1.6.7

  • debian•joserfc

    all | < 1.6.8-1

  • PyPI•joserfc

    ≥ 1.3.4, < 1.6.7

References (8)