Vulnerability 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 Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/equinor/resdata/commit/9f8fd6db472e0696080b768389914d60a45390
- https://github.com/equinor/resdata/commit/d3f45828e9413506b8e8160a9304f4b7b06dce
- https://github.com/equinor/resdata/commit/ee8cc12b026d945df3077bc98e211ee45f80a4
- https://github.com/equinor/resdata/pull/1166
- https://github.com/equinor/resdata/releases/tag/6.2.9
- https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x
FAQ
What is CVE-2026-55209?
CVE-2026-55209 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 arra...
How severe is CVE-2026-55209?
CVE-2026-55209 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-55209?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.