{"cve":"CVE-2026-55209","nvd":{"published":"2026-09-14T20:16:47.487","modified":"2026-09-30T17:51:56.193","status":"Deferred","description":"resdata is software for reading and writing result files from the Eclipse reservoir simulator. Prior to 6.2.9, resdata insufficiently validates numeric fields, grid dimensions, keyword sizes, and array indexes while parsing untrusted GRDECL files in lib/resdata/rd_kw_grdecl.cpp and lib/resdata/rd_grid.cpp. Malformed COORD, ZCORN, CORSNUM, ACTNUM, or MAPAXES data can reach rd_grid_alloc_GRDECL_kw__ with inconsistent lengths, while unbounded floating-point conversion can exceed the intended parser buffer. In a network service that accepts untrusted GRDECL files, these conditions can cause a classic buffer overflow, out-of-bounds reads, invalid array access, NULL pointer dereference, memory corruption, or service termination. This issue is fixed in version 6.2.9.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-120","CWE-125","CWE-129","CWE-476"],"references":["https://github.com/equinor/resdata/commit/9f8fd6db472e0696080b768389914d60a453904f","https://github.com/equinor/resdata/commit/d3f45828e9413506b8e8160a9304f4b7b06dcefc","https://github.com/equinor/resdata/commit/ee8cc12b026d945df3077bc98e211ee45f80a433","https://github.com/equinor/resdata/pull/1166","https://github.com/equinor/resdata/releases/tag/6.2.9"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-55209","score":0.0078,"percentile":0.55641,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-pr85-w493-9w3x","url":"https://osv.dev/vulnerability/GHSA-pr85-w493-9w3x","summary":"resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read","modified":"2026-08-19T12:55:43.580455017Z","packages":[{"ecosystem":"PyPI","name":"resdata","purl":"pkg:pypi/resdata","ranges":["<6.2.9"],"fixed":["6.2.9"]}]},{"id":"PYSEC-2026-3694","url":"https://osv.dev/vulnerability/PYSEC-2026-3694","summary":"resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read","modified":"2026-08-19T12:45:08.693778249Z","packages":[{"ecosystem":"PyPI","name":"resdata","purl":"pkg:pypi/resdata","ranges":["<6.2.9"],"fixed":["6.2.9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}