{"id":"CVE-2026-44375","aliases":["GHSA-2cwq-pwfr-wcw3"],"url":"https://o3.security/vulnerability/CVE-2026-44375","summary":"Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException","details":"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.","published":"2026-05-14T14:32:09.506Z","modified":"2026-08-07T11:51:11.407780011Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"Nerdbank.MessagePack","fixedVersion":"1.1.62"}],"fix":{"url":"https://github.com/AArnott/Nerdbank.MessagePack/commit/7d1eb319cfabe7280e70699946c9a48579fa2f30","label":"AArnott/Nerdbank.MessagePack@7d1eb31"},"references":[{"type":"WEB","url":"https://github.com/AArnott/Nerdbank.MessagePack/releases/tag/v1.1.62"},{"type":"ADVISORY","url":"https://github.com/AArnott/Nerdbank.MessagePack/security/advisories/GHSA-2cwq-pwfr-wcw3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44375.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44375"},{"type":"FIX","url":"https://github.com/AArnott/Nerdbank.MessagePack/commit/7d1eb319cfabe7280e70699946c9a48579fa2f30"},{"type":"FIX","url":"https://github.com/AArnott/Nerdbank.MessagePack/pull/941"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:11.407780011Z"}}