{"id":"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.","aliases":["GHSA-2cwq-pwfr-wcw3"],"modified":"2026-05-18T06:00:27.001842029Z","published":"2026-05-14T14:32:09.506Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44375.json","cwe_ids":["CWE-789"],"cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/aarnott/nerdbank.messagepack","events":[{"introduced":"0"},{"fixed":"7d1eb319cfabe7280e70699946c9a48579fa2f30"}]}],"versions":["v1.1.25","v1.1.24-beta","v1.0.43","v1.0.40","v1.0.11","v1.0.2","v0.12.39-rc","v0.12.28-rc","v0.12.14-rc","v0.12.4-rc","v0.12.2-rc","v0.11.60-rc","v0.11.54-rc","v0.11.53-rc","v0.11.50-rc","v0.11.34-rc","v0.11.6-rc","v0.11.8-rc","v0.11.1-rc","v0.10.95-rc","v0.10.89-rc","v0.10.87-rc","v0.10.63-rc","v0.10.60-rc","v0.10.42-rc","v0.10.33-rc","v0.10.25-rc","v0.10.7-rc","v0.10.2-rc","v0.9.35-rc","v0.9.26-rc","v0.9.23-rc","v0.9.14-rc","v0.9.12-rc","v0.8.131-rc","v0.8.128-rc","v0.8.111-rc","v0.8.102-rc","v0.8.90-rc","v0.8.92-rc","v0.8.82-rc","v0.8.67-rc","v0.8.54-rc","v0.8.46-rc","v0.8.30-rc","v0.8.1-rc","v0.7.1-beta","v0.6.27-beta","v0.6.7-beta","v0.6.1-beta","v0.5.80-beta","v0.5.72-beta","v0.5.70-beta","v0.5.57-beta","v0.5.37-beta","v0.5.1-beta","v0.4.5-beta","v0.3.161-beta","v0.3.151-beta","v0.3.120-beta","v0.3.38-beta","v0.3.27-alpha","v0.3.2-alpha","v0.2.108-alpha","v0.2.82-alpha","v0.2.52-alpha","v0.2.34-alpha","v0.2.2-alpha","v0.1.734-alpha"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44375.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}