Metadata Exposure in Apache Pulsar Functions Worker API
CVE-2026-105936

5.3MEDIUM

Key Information:

Vendor

Apache
Status
Apache Pulsar
Vendor
CVE Published:
21 October 2026

What is CVE-2026-105936?

The Pulsar Functions worker REST API has an authorization oversight that allows authenticated clients to access the entire catalog of installed connectors through the functions connectors endpoint, bypassing required super-user access checks. This exposure enables users to view metadata about various connectors, including their names and descriptions, but does not provide capabilities to modify or manage connectors. Versions affected include Apache Pulsar 2.4.1 to before 4.0.14 and 4.1.0 to before 4.2.5. Users are encouraged to upgrade to the specified patched versions to mitigate this risk.

Affected Version(s)

Apache Pulsar 2.4.1 < 4.0.14

Apache Pulsar 4.1.0 < 4.2.5

References

https://pulsar.apache.org/security/CVE-2026-105936/
vendor-advisory
https://lists.apache.org/thread.html/dn0cg4l3yolw90f8rjyv...
vendor-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mingsheng Lin of Institute of Information Engineering, CAS
Xingchen Chen of Institute of Information Engineering, CAS
Qixu Liu of Institute of Information Engineering, CAS
.