{"id":"CVE-2026-105935","revision":null,"records":[{"revision":"9ede445557f54b33aa282ab7c0150eb1","observedAt":"2026-10-23T22:48:20.692+00:00","statement":{"source":"cve-program","id":"CVE-2026-105935","aliases":[],"title":"Apache Pulsar: Function trigger publishes to the input topic without checking the caller's produce permission","description":"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.\n\nWhen 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 are not restricted to the function's own tenant or namespace, and registering a function does not require produce permission on its input topics.\n\nAs a result, an authenticated user who is authorized to manage functions in a namespace, for example a role granted the functions permission on that namespace, can cause the Functions Worker to publish messages with caller-controlled content to a topic that the user is not authorized to produce to, including topics in other tenants. These messages are published under the identity of the Functions Worker. The issue does not require any function instance to be running or any function code to be executed. It requires that the Functions Worker's broker-client identity is itself authorized to produce to the target topic and, in Apache Pulsar 2.3.0 and later versions, to list the subscriptions of the target topic, as is the case when that identity is a superuser. The impact is on the integrity of the data in the affected topics: consumers of those topics may receive messages from a user who is not permitted to publish them. This concerns the Functions Worker REST API as called by an external, authenticated client; it does not change the security model for function code, which must be fully trusted.\n\nIn fixed versions, when authorization is enabled, triggering a function additionally requires the caller to be authorized to produce to the selected input topic before any message is published.\n\nThis issue affects Apache Pulsar versions from 2.0.0-rc1-incubating before 4.0.14 and from 4.1.0 before 4.2.5.\n\n- 4.0.x version users should upgrade to at least 4.0.14.\n- 4.1.x and 4.2.x version users should upgrade to at least 4.2.5.\n\nUsers operating versions prior to those listed above should upgrade to the aforementioned patched versions or newer versions.\n\nThe 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/.\n\nUsers 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. 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.","state":0,"publishedAt":"2026-10-21T18:10:24.056+00:00","modifiedAt":"2026-10-23T21:59:37.544+00:00","affected":[{"ecosystem":"Vendor product","name":"Apache Pulsar","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Apache Software Foundation\",\n                    \"product\": \"Apache Pulsar\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.0.0-rc1-incubating\",\n                            \"lessThan\": \"4.0.14\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"4.1.0\",\n                            \"lessThan\": \"4.2.5\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","score":4.9,"severity":"MEDIUM"}],"references":["https://pulsar.apache.org/security/CVE-2026-105935/","https://lists.apache.org/thread.html/nrk7hkyzgo447gm58ry6n8ohl8z5j6nl"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105935","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105935","identifiers":["CVE-2026-105935"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-26T13:35:31.4084177+00:00","complete":true,"records":1756,"lastAttemptAt":"2026-10-26T13:35:31.4084177+00:00","lastSuccessAt":"2026-10-26T13:35:31.5775932+00:00","error":null,"lastVerifiedAt":"2026-10-26T13:35:31.5775972+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-5ba1945314e042c2ced14b33f3680fa71692812d925544312b218f5eb8a26e71-e7962156c388e029d9e5dbbcda79fbd40ade61bdd41d51546adb4696b3e29228","complete":true,"records":414161,"lastAttemptAt":"2026-10-26T13:35:30.7074205+00:00","lastSuccessAt":"2026-10-26T11:36:10.2537359+00:00","error":null,"lastVerifiedAt":"2026-10-26T13:35:30.7074205+00:00","snapshotPublishedAt":"2026-10-26T11:28:55+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-43321610382942b8ad8c85917eab1546","complete":false,"records":4735,"lastAttemptAt":"2026-10-26T13:35:59.8295777+00:00","lastSuccessAt":"2026-10-24T23:18:49.862+00:00","error":"InvalidDataException","lastVerifiedAt":"2026-10-24T23:18:49.862+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":4564,"expectedIdentifiers":13477},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-26T13:35:31.4084177+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-26T13:35:31.4084177+00:00","lastSuccessAt":"2026-10-26T13:35:31.5784069+00:00","error":null,"lastVerifiedAt":"2026-10-26T13:35:31.5784074+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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