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This issue is fixed in version 6.1.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":3.7,"severity":null}],"references":["https://github.com/mcollina/msgpack5/security/advisories/GHSA-qw35-55vc-rhgj","https://github.com/mcollina/msgpack5/commit/82b70393a824e1088a45a377548d1d9ab82faf91","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95107","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 8, 2026, 5:05:34 PM","dateUpdated":"Oct 14, 2026, 1:01:55 AM"},"relatedAdvisories":[{"id":"msrc_CVE-2026-107296","title":"msgpack5: Decoding negative int64 values mutates the input buffer","vulnerabilityIds":["CVE-2026-107296"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer while computing the value. Applications that retain or reuse encoded input for integrity checks, logging, or later processing can observe silently corrupted data, while positive integers and other MessagePack value types are unaffected. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-107296","identifiers":["CVE-2026-107296"]},"retained":false,"historicalAffected":[]},{"revision":"2b06e7d252f74411b596a4c1b4b514f0","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-qw35-55vc-rhgj","aliases":["CVE-2026-107296"],"title":"msgpack5: Decoding negative int64 values mutates the input buffer","description":"### Impact\n\nDecoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer. Applications that retain or reuse encoded input for integrity checks, logging, or subsequent processing may observe silently corrupted data.\n\nPositive integers and other MessagePack value types are not affected.\n\n### Patches\n\nThe decoder now computes signed 64-bit values without writing to the input buffer.\n\n### Workarounds\n\nCopy untrusted MessagePack input before decoding it, or do not retain or reuse input buffers after decoding.","state":0,"publishedAt":"2026-10-08T17:39:30+00:00","modifiedAt":"2026-10-08T17:45:03.538504+00:00","affected":[{"ecosystem":"npm","name":"msgpack5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"6.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/mcollina/msgpack5/security/advisories/GHSA-qw35-55vc-rhgj","https://github.com/mcollina/msgpack5/commit/82b70393a824e1088a45a377548d1d9ab82faf91","https://github.com/mcollina/msgpack5","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://github.com/advisories/GHSA-qw35-55vc-rhgj","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qw35-55vc-rhgj","identifiers":["GHSA-qw35-55vc-rhgj","CVE-2026-107296"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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