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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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
https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-14 20:16

Updated : 2026-09-14 21:17

NVD link : CVE-2026-55209

Mitre link : CVE-2026-55209

CVE.ORG link : CVE-2026-55209

JSON object : View

Products Affected

No product.

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-125

Out-of-bounds Read

CWE-129

Improper Validation of Array Index

CWE-476

NULL Pointer Dereference

{"id": "CVE-2026-55209", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55209", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-14T20:10:56.774434Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "equinor", "product": "resdata", "versions": [{"status": "affected", "version": "< 6.2.9"}]}]}], "published": "2026-09-14T20:16:47.487", "references": [{"url": "https://github.com/equinor/resdata/commit/9f8fd6db472e0696080b768389914d60a453904f", "source": "security-advisories@github.com"}, {"url": "https://github.com/equinor/resdata/commit/d3f45828e9413506b8e8160a9304f4b7b06dcefc", "source": "security-advisories@github.com"}, {"url": "https://github.com/equinor/resdata/commit/ee8cc12b026d945df3077bc98e211ee45f80a433", "source": "security-advisories@github.com"}, {"url": "https://github.com/equinor/resdata/pull/1166", "source": "security-advisories@github.com"}, {"url": "https://github.com/equinor/resdata/releases/tag/6.2.9", "source": "security-advisories@github.com"}, {"url": "https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x", "source": "security-advisories@github.com"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-120"}, {"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-129"}, {"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-14T21:17:13.457", "sourceIdentifier": "security-advisories@github.com"}