CVE-2026-55209 Details
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.
A buffer overflow vulnerability has been identified in resdata, a tool for managing result files from the Eclipse reservoir simulator. This issue affects versions prior to 6.2.9. The vulnerability arises from inadequate validation of numeric fields, grid dimensions, keyword sizes, and array indexes when parsing untrusted GRDECL files. Malformed data in specific keywords can lead to inconsistent lengths, allowing for classic buffer overflow scenarios, out-of-bounds reads, invalid array accesses, NULL pointer dereferences, memory corruption, or service terminations, particularly in network services that handle untrusted GRDECL files.
Users can upgrade to resdata version 6.2.9 or 6.3.0 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/equinor/resdata/commit/9f8fd6db472e0696080b768389914d60a453904f | [email protected] | Source CodeVendor |
| https://github.com/equinor/resdata/commit/d3f45828e9413506b8e8160a9304f4b7b06dcefc | [email protected] | Source CodeVendor |
| https://github.com/equinor/resdata/commit/ee8cc12b026d945df3077bc98e211ee45f80a433 | [email protected] | Source CodeVendor |
| https://github.com/equinor/resdata/pull/1166 | [email protected] | Issue TrackingVendor |
| https://github.com/equinor/resdata/releases/tag/6.2.9 | [email protected] | Release NotesVendor |
| https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-120 | Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') | [email protected] |
| CWE-125 | Out-of-bounds Read | [email protected] |
| CWE-129 | Improper Validation of Array Index | [email protected] |
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Equinor resdata | < 6.2.9 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |