{"api_version":"1","generated_at":"2026-10-08T21:44:56+00:00","cve":"CVE-2026-107296","urls":{"html":"https://cve.report/CVE-2026-107296","api":"https://cve.report/api/cve/CVE-2026-107296.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-107296","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-107296"},"summary":{"title":"msgpack5: Decoding negative int64 values mutates the input buffer","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. 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. This issue is fixed in version 6.1.0.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-10-08 17:17:15","updated_at":"2026-10-08 20:48:36"},"problem_types":["CWE-471","CWE-471 CWE-471: Modification of Assumed-Immutable Data (MAID)"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"3.7","severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":3.7,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"3.7","severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"references":[{"url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-qw35-55vc-rhgj","name":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-qw35-55vc-rhgj","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","name":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/mcollina/msgpack5/commit/82b70393a824e1088a45a377548d1d9ab82faf91","name":"https://github.com/mcollina/msgpack5/commit/82b70393a824e1088a45a377548d1d9ab82faf91","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107296","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107296","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"mcollina","product":"msgpack5","version":"affected < 6.1.0","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"msgpack5","vendor":"mcollina","versions":[{"status":"affected","version":"< 6.1.0"}]}],"descriptions":[{"lang":"en","value":"msgpack5 is a msgpack v5 implementation for node.js and the browser. 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. This issue is fixed in version 6.1.0."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-471","description":"CWE-471: Modification of Assumed-Immutable Data (MAID)","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-10-08T17:05:34.059Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-qw35-55vc-rhgj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mcollina/msgpack5/security/advisories/GHSA-qw35-55vc-rhgj"},{"name":"https://github.com/mcollina/msgpack5/commit/82b70393a824e1088a45a377548d1d9ab82faf91","tags":["x_refsource_MISC"],"url":"https://github.com/mcollina/msgpack5/commit/82b70393a824e1088a45a377548d1d9ab82faf91"},{"name":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","tags":["x_refsource_MISC"],"url":"https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"}],"source":{"advisory":"GHSA-qw35-55vc-rhgj","discovery":"UNKNOWN"},"title":"msgpack5: Decoding negative int64 values mutates the input buffer"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-107296","datePublished":"2026-10-08T17:05:34.059Z","dateReserved":"2026-10-07T15:53:23.587Z","dateUpdated":"2026-10-08T17:05:34.059Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-08 17:17:15","lastModifiedDate":"2026-10-08 20:48:36","problem_types":["CWE-471","CWE-471 CWE-471: Modification of Assumed-Immutable Data (MAID)"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":3.7,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"107296","Ordinal":"1","Title":"msgpack5: Decoding negative int64 values mutates the input buffe","CVE":"CVE-2026-107296","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"107296","Ordinal":"1","NoteData":"msgpack5 is a msgpack v5 implementation for node.js and the browser. 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. This issue is fixed in version 6.1.0.","Type":"Description","Title":"msgpack5: Decoding negative int64 values mutates the input buffe"}]}}}