Package Instance
Lookup for vulnerable packages by Package URL.
GET /api/packages/923267?format=api
{ "url": "http://public2.vulnerablecode.io/api/packages/923267?format=api", "purl": "pkg:maven/org.msgpack/msgpack-core@0.8.10", "type": "maven", "namespace": "org.msgpack", "name": "msgpack-core", "version": "0.8.10", "qualifiers": {}, "subpath": "", "is_vulnerable": true, "next_non_vulnerable_version": "0.9.11", "latest_non_vulnerable_version": "0.9.11", "affected_by_vulnerabilities": [ { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/49579?format=api", "vulnerability_id": "VCID-mnu1-xpgp-6kgd", "summary": "MessagePack for Java Vulnerable to Remote DoS via Malicious EXT Payload Allocation\nAffected Components:\n```\norg.msgpack.core.MessageUnpacker.readPayload()\norg.msgpack.core.MessageUnpacker.unpackValue()\norg.msgpack.value.ExtensionValue.getData()\n```\nA denial-of-service vulnerability exists in MessagePack for Java when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later trusts the declared EXT payload length when materializing the extension data. When ExtensionValue.getData() is invoked, the library attempts to allocate a byte array of the declared length without enforcing any upper bound. A malicious .msgpack file of only a few bytes can therefore trigger unbounded heap allocation, resulting in JVM heap exhaustion, process termination, or service unavailability. This vulnerability is triggered during model loading / deserialization, making it a model format vulnerability suitable for remote exploitation.", "references": [ { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2026-21452", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.00028", "scoring_system": "epss", "scoring_elements": "0.08441", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.00028", "scoring_system": "epss", "scoring_elements": "0.08395", "published_at": "2026-06-09T12:55:00Z" }, { "value": "0.00028", "scoring_system": "epss", "scoring_elements": "0.08364", "published_at": "2026-06-08T12:55:00Z" }, { "value": "0.00028", "scoring_system": "epss", "scoring_elements": "0.08421", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.00028", "scoring_system": "epss", "scoring_elements": "0.08429", "published_at": "2026-06-05T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-21452" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21452", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21452" }, { "reference_url": "https://github.com/msgpack/msgpack-java", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/msgpack/msgpack-java" }, { "reference_url": "https://github.com/msgpack/msgpack-java/commit/daa2ea6b2f11f500e22c70a22f689f7a9debdeae", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-02T21:21:49Z/" } ], "url": "https://github.com/msgpack/msgpack-java/commit/daa2ea6b2f11f500e22c70a22f689f7a9debdeae" }, { "reference_url": "https://github.com/msgpack/msgpack-java/releases/tag/v0.9.11", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-02T21:21:49Z/" } ], "url": "https://github.com/msgpack/msgpack-java/releases/tag/v0.9.11" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1124587", "reference_id": "1124587", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1124587" }, { "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21452", "reference_id": "CVE-2026-21452", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21452" }, { "reference_url": "https://github.com/advisories/GHSA-cw39-r4h6-8j3x", "reference_id": "GHSA-cw39-r4h6-8j3x", "reference_type": "", "scores": [ { "value": "HIGH", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" } ], "url": "https://github.com/advisories/GHSA-cw39-r4h6-8j3x" }, { "reference_url": "https://github.com/msgpack/msgpack-java/security/advisories/GHSA-cw39-r4h6-8j3x", "reference_id": "GHSA-cw39-r4h6-8j3x", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" }, { "value": "HIGH", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-02T21:21:49Z/" } ], "url": "https://github.com/msgpack/msgpack-java/security/advisories/GHSA-cw39-r4h6-8j3x" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/73199?format=api", "purl": "pkg:maven/org.msgpack/msgpack-core@0.9.11", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:maven/org.msgpack/msgpack-core@0.9.11" } ], "aliases": [ "CVE-2026-21452", "GHSA-cw39-r4h6-8j3x" ], "risk_score": 4.0, "exploitability": "0.5", "weighted_severity": "8.0", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-mnu1-xpgp-6kgd" } ], "fixing_vulnerabilities": [], "risk_score": "4.0", "resource_url": "http://public2.vulnerablecode.io/packages/pkg:maven/org.msgpack/msgpack-core@0.8.10" }