Severity:
CVSS 4.0: 5.3 (medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected versions:
- Apache Pulsar 2.4.1 before 4.0.14
- Apache Pulsar 4.1.0 before 4.2.5
Description:
The Pulsar Functions worker REST API provides two endpoints that return the
catalog of Pulsar IO connectors installed on the functions worker: the worker
connectors endpoint (/admin/v2/worker/connectors) and the deprecated functions
connectors endpoint (/admin/v2/functions/connectors and
/admin/v3/functions/connectors). When authorization is enabled, the worker
connectors endpoint requires super-user access. The functions connectors
endpoint, served both by the functions worker and by a broker running the
functions worker, returns the same catalog without this check.
As a result, when authentication and authorization are enabled, any
authenticated client can read the connector catalog through the functions
connectors endpoint, regardless of the permissions granted to its role and
without super-user access. Unauthenticated requests are rejected unless
anonymous access is configured with an anonymous user role.
The catalog contains the connector type definitions installed in the functions
worker's connectors directory: the connector name, its description, and the
source, sink and configuration class names. It does not contain configured
source or sink instances, their configuration values or credentials, and an
installed connector type does not indicate that a connector is configured or
running. The impact is limited to disclosure of this metadata, which can
include the names and descriptions of custom connectors installed by the
operator. The issue does not allow modifying the catalog or managing
connectors. Connector definitions that have a source or sink class are also
returned by the built-in sources and sinks endpoints to authenticated clients.
In fixed versions, the functions connectors endpoint applies the same checks as
the worker connectors endpoint, so that it requires super-user access when
authorization is enabled. Clients that are not super-users can use the built-in
sources and sinks endpoints to list the available connector types.
This issue affects Apache Pulsar versions from 2.4.1 before 4.0.14 and from
4.1.0 before 4.2.5.
- 4.0.x version users should upgrade to at least 4.0.14.
- 4.1.x and 4.2.x version users should upgrade to at least 4.2.5.
Users operating versions prior to those listed above should upgrade to the
aforementioned patched versions or newer versions.
The currently supported Apache Pulsar release lines are 4.0.x and 5.0.x. The
supported versions schedule is available at
https://pulsar.apache.org/contribute/release-policy/.
Credit:
Mingsheng Lin of Institute of Information Engineering, CAS (finder)
Xingchen Chen of Institute of Information Engineering, CAS (finder)
Qixu Liu of Institute of Information Engineering, CAS (finder)
References:
https://pulsar.apache.org/security/CVE-2026-105936/
https://pulsar.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-105936
