CVE-2026-55209
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.
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9.8
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS probability
- 0.42%
- CWE
- CWE-120, CWE-125, CWE-129, CWE-476
- Published
- 2026-09-14
- Last modified
- 2026-09-14
Affected products
- equinor resdata
Weakness type
Related vulnerabilities
- CVE-2026-82542 — Tenda HG10 Boa Web Server formIPv6Routing buffer overflow
- CVE-2026-44756 — Memory Corruption vulnerability in SAP Extended Passport (EPP) Processing
- CVE-2026-17040 — Vulnerabilities in IBM AIX and PowerVM VIOS
- CVE-2025-12686 — Buffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in AdminCenter in Synology BeeStati
- CVE-2026-90608 — Totolink A3002MU boa formPortFw buffer overflow
- CVE-2026-90606 — Totolink A3002MU boa formIpv6Setup buffer overflow
- CVE-2026-90605 — Totolink A3002MU boa formFilter buffer overflow
- CVE-2026-87931 — Behavioral Technology Group Pavlok Behavioral Conditioning Wearable Apple Notification Center Service Event buffer overflow