CVE-2026-105935: Apache Pulsar: The Pulsar Functions Worker provides a REST API endpoint for triggering a function, which publishes a caller-supplied value to one of the function's configured input topics
CVE-2026-105935 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- Medium
- CVSS base score
- 6.5 (Red Hat), 4.9 (Apache)
- Weakness
- CWE-267
- Fixed releases
- Apache: 4.0.14, 4.2.5, 2.4.0
- Red Hat: 4.0.14, 4.2.5
- Listed by VulniPulse
- Record changed
Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-105935; each belongs to its advisory, not to every product listed. How records are collected and checked.
How do I fix CVE-2026-105935?
Upgrade to a fixed release named by the vendor:
- Apache: 4.0.14, 4.2.5, 2.4.0
- Red Hat: 4.0.14, 4.2.5
- This issue affects Apache Pulsar versions from 2.0.0-rc1-incubating 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. (Apache)
- Users operating versions prior to those listed above should upgrade to the aforementioned patched versions or newer versions. (Apache)
Vendor advisories for CVE-2026-105935
Apache
1 advisory- Advisory severityMedium4.9
Medium [CVE-2026-105935] Apache Pulsar: The Pulsar Functions Worker provides a REST API endpoint for triggering a function, which publishes a caller-supplied value to one of the function's configured input topics
CVE-2026-105935Source published Source updated
The Pulsar Functions Worker provides a REST API endpoint for triggering a function, which publishes a caller-supplied value to one of the function's configured input topics. The Functions Worker performs this publish with its own broker client, which authenticates with the Worker's configured broker-client credentials rather than the credentials of the API caller. When authorization is enabled, in Apache Pulsar 2.4.0 and later versions, the trigger endpoint checks only that the caller is authorized to perform function operations in the function's namespace. It does not check that the caller is authorized to produce to the input topic that the message is published to. Versions before 2.4.0 do not perform a caller authorization check for the trigger endpoint at all. Function input topics…
- Affected products in this advisory
- Apache Pulsar
- Source-reported affected versions
- 2.0.0-rc1-incubating before 4.0.14
- 4.1.0 before 4.2.5
- Source-reported fixed versions
- 4.0.14
- 4.2.5
- 2.4.0
- Mitigation guidance
- This issue affects Apache Pulsar versions from 2.0.0-rc1-incubating 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.
- Users of Apache Pulsar 2.4.0 and later versions with authorization enabled who cannot upgrade immediately can limit the permission to manage functions to trusted roles.
- Workarounds
- Users of versions before 2.4.0 should restrict access to the Functions Worker REST API to trusted callers, because in these versions the trigger endpoint does not check the caller's permission to manage functions.
Red Hat
1 advisory- Advisory severityMedium6.5
Medium [CVE-2026-105935] org.apache.pulsar/pulsar-functions-worker: pulsar-functions-worker: Unauthorized message publication via missing topic authorization check
CVE-2026-105935Source published Source updated
org.apache.pulsar/pulsar-functions-worker: pulsar-functions-worker: Unauthorized message publication via missing topic authorization check. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-267.
- Related products — impact not confirmed
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- < 2.4.0
- < 2.0.0-rc1
- < 4.0.14
- < 4.1.0
5 more entries in the full advisory.
- Source-reported fixed versions
- 4.0.14
- 4.2.5
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
References
More Apache advisories
CVE-2026-105945Oct 21, 2026Apache Pulsar: The Pulsar Packages Management ServiceCVE-2026-105942Oct 21, 2026Apache Pulsar: When a configured proxy role sends a request to the broker on behalfCVE-2026-105938Oct 21, 2026Apache Pulsar namespaces can restrictCVE-2026-105937Oct 21, 2026Apache Pulsar shadow topics (PIP-180) are topicsCVE-2026-105936Oct 21, 2026Apache Pulsar: The Pulsar Functions worker REST API provides two endpointsCVE-2026-105934Oct 21, 2026The Apache Pulsar broker admin REST API provides a truncate operation for persistent
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