{"metadata": {"vulnerability": "CVE-2026-126366", "count": 11, "kinds": {"milestone": 4, "sighting": 3, "kev": 0, "other": 4}, "linked_omitted": 0}, "data": [{"timestamp": "2026-10-30T09:02:31Z", "date_only": false, "value": "2026-10-30T09:02:31.000000Z", "kind": "sighting", "label": "Published proof of concept", "source": "https://github.com/msgpack/msgpack-ruby/security/advisories/GHSA-73v3-wf97-vpgj", "record": "CVE-2026-126366", "field": "creation_timestamp", "uuid": "4f6d76da-c504-472e-bd25-b4d3ff8e6a71", "url": "https://github.com/msgpack/msgpack-ruby/security/advisories/GHSA-73v3-wf97-vpgj", "metric_role": "exploit_publication", "metric_basis": "sighting_report"}, {"timestamp": "2026-11-10T21:12:01.228Z", "date_only": false, "value": "2026-11-10T21:12:01.228Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-126366", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-11-12T22:41:38.409Z", "date_only": false, "value": "2026-11-12T22:41:38.409Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-126366", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-11-12T22:41:38.409Z", "date_only": false, "value": "2026-11-12T22:41:38.409Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-126366", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-11-12T22:41:38.409Z", "date_only": false, "value": "2026-11-12T22:41:38.409Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / GitHub_M", "record": "CVE-2026-126366", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-11-12T22:45:20.942Z", "date_only": false, "value": "2026-11-12T22:45:20.942845Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117605893421990432", "record": "CVE-2026-126366", "field": "creation_timestamp", "uuid": "7a00b271-d88a-4892-b541-93d3c15d0c16", "content": "CVE-2026-126366 msgpack-java JRuby decoder allocates from declared header counts with no cap: 5-byte message forces multi-GiB OOM MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.7, the Java-platform msgpack gem for JRuby allocated arrays and byte buffers directly from attacker-controlled array32, str32, and bin32 declared sizes before confirming that corresponding elements or bytes were available. A short MessagePack header could therefore trigger a very large allocation or sustained heap growth when an application decoded untrusted input through MessagePack.unpack or MessagePack::Unpacker, potentially exhausting the shared JVM heap. map32 and declared counts at or above 2^31 did not use the affected allocation behavior. This issue is fixed in version 1.8.7.\nhttps://www.cve.org/CVERecord?id=CVE-2026-126366https://github.com/msgpack/msgpack-ruby/security/advisories/GHSA-73v3-wf97-vpgjhttps://github.com/msgpack/msgpack-ruby/commit/ca0efc1256c687b428c46dd68ce000ff515d53f2https://github.com/msgpack/msgpack-ruby/releases/tag/v1.8.6https://github.com/msgpack/msgpack-ruby/releases/tag/v1.8.7#msgpack #msgpack-ruby#CVE_2026_126366#bot", "url": "https://infosec.exchange/users/cve/statuses/117605893421990432"}, {"timestamp": "2026-11-12T22:54:59Z", "date_only": false, "value": "2026-11-12T22:54:59Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-73V3-WF97-VPGJ", "record": "GHSA-73V3-WF97-VPGJ", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-12T22:54:59Z", "date_only": false, "value": "2026-11-12T22:54:59Z", "kind": "other", "label": "Updated", "source": "github \u00b7 GHSA-73V3-WF97-VPGJ", "record": "GHSA-73V3-WF97-VPGJ", "field": "modified", "linked_record": true}, {"timestamp": "2026-11-13T00:20:12.397Z", "date_only": false, "value": "2026-11-13T00:20:12.397", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-126366", "record": "FKIE_CVE-2026-126366", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-13T00:20:12.397Z", "date_only": false, "value": "2026-11-13T00:20:12.397", "kind": "other", "label": "Updated", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-126366", "record": "FKIE_CVE-2026-126366", "field": "lastModified", "linked_record": true}, {"timestamp": "2026-11-13T01:02:37.233Z", "date_only": false, "value": "2026-11-13T01:02:37.233943Z", "kind": "sighting", "label": "Seen", "source": "https://bsky.app/profile/thehackerwire.bsky.social/post/3n25rxwwvzq2h", "record": "CVE-2026-126366", "field": "creation_timestamp", "uuid": "0f81da52-79c9-4801-8b0b-e4362e3e6dad", "content": "\ud83d\udfe0 CVE-2026-126366 - High (7.5)\n\nMessagePack for Ruby is an implementation of the MessagePack binary serialization format. 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