CVE-2026-55209— resdata insufficiently validates untrusted GRDECL files
Quick assessment
Affected
equinor resdata
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
resdata 是一款用于读取和写入 Eclipse 油藏模拟器结果文件的软件。在 6.2.9 版本之前，resdata 在解析不受信任的 GRDECL 文件时（涉及 lib/resdata/rd_kw_grdecl.cpp 和 lib/resdata/rd_grid.cpp），对数值字段、网格维度、关键字大小和数组索引的验证不足。格式错误的 COORD、ZCORN、CORSNUM、ACTNUM 或 MAPAXES 数据可能以不一致的长度到达 函数，同时，无边界限制的浮点数转换可能超出预期的解析器缓冲区。在接受不受
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-55209
Vulnerability Information
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Vulnerability Title
resdata insufficiently validates untrusted GRDECL files
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-55209
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-55209 (4)
Vendor Advisories for CVE-2026-55209 (1)
Vendor Pages for CVE-2026-55209 (1)
IV. Related Vulnerabilities
Same weakness: CWE-120
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V. Comments for CVE-2026-55209
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