{"id":"CVE-2026-42241","aliases":["GHSA-rrjr-v56m-ww88"],"url":"https://o3.security/vulnerability/CVE-2026-42241","summary":"ParquetSharp: Possible Stack Overflow When Reading a ParquetFile with Large Decimal Type Width","details":"ParquetSharp is a .NET library for reading and writing Apache Parquet files. From version 18.1.0 to before version 23.0.0.1, DecimalConverter.ReadDecimal makes a stackalloc using what might be an attacker-supplied value. If an attacker declares a decimal column with some unreasonable width, this could lead to a stack overflow. In a service environment, this would potentially take down a service. This affects applications using ParquetSharp to read untrusted Parquet files in a network service. This issue has been patched in version 23.0.0.1.","published":"2026-05-07T18:52:06.773Z","modified":"2026-08-07T11:51:06.249542248Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"ParquetSharp","fixedVersion":"23.0.0.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/G-Research/ParquetSharp/releases/tag/23.0.0.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42241.json"},{"type":"ADVISORY","url":"https://github.com/G-Research/ParquetSharp/security/advisories/GHSA-rrjr-v56m-ww88"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42241"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:06.249542248Z"}}