{"id":"CVE-2026-44375","sourceIdentifier":"security-advisories@github.com","published":"2026-05-14T15:16:48.383","lastModified":"2026-06-17T10:50:34.243","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Nerdbank.MessagePack is a NativeAOT-compatible MessagePack serialization library. Prior to 1.1.62, Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a StackOverflowException, which is not catchable by user code and terminates the process. This vulnerability is fixed in 1.1.62."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"AArnott","product":"Nerdbank.MessagePack","versions":[{"version":"< 1.1.62","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-14T16:01:58.538455Z","id":"CVE-2026-44375","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-789"}]}],"references":[{"url":"https://github.com/AArnott/Nerdbank.MessagePack/commit/7d1eb319cfabe7280e70699946c9a48579fa2f30","source":"security-advisories@github.com"},{"url":"https://github.com/AArnott/Nerdbank.MessagePack/pull/941","source":"security-advisories@github.com"},{"url":"https://github.com/AArnott/Nerdbank.MessagePack/releases/tag/v1.1.62","source":"security-advisories@github.com"},{"url":"https://github.com/AArnott/Nerdbank.MessagePack/security/advisories/GHSA-2cwq-pwfr-wcw3","source":"security-advisories@github.com"}]}