{"vulnerability": "cve-2026-21452", "sightings": [{"uuid": "bc1ed51b-cdb9-4ea8-9f48-30f38ae172d4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-21452", "type": "seen", "source": "https://www.govcert.gov.hk/en/alerts_detail.php?id=1833", "content": "", "creation_timestamp": "2026-04-21T21:00:00.000000Z"}, {"uuid": "3c0d8f63-8dbe-4c41-a2be-dc8f1dd2c23c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-21452", "type": "published-proof-of-concept", "source": "Telegram/DFhOoz2ba5lY6tfZKWDQmHfJO-BCe0MWUTSMMxzWfmXNHIA", "content": "", "creation_timestamp": "2026-01-03T00:08:40.000000Z"}, {"uuid": "1dcd0ccc-5d9b-47f3-a68f-94d487c4f5a8", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-21452", "type": "seen", "source": "https://gist.github.com/alon710/6ea497fa633d979c4b651698373b8b7b", "content": "", "creation_timestamp": "2026-01-24T22:43:04.000000Z"}, {"uuid": "02dc49b0-738d-4bad-ac7a-22f3ac9f0e72", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-21452", "type": "published-proof-of-concept", "source": "https://github.com/msgpack/msgpack-java/security/advisories/GHSA-cw39-r4h6-8j3x", "content": "", "creation_timestamp": "2026-01-02T18:50:31.000000Z"}]}