Vulnerability-Lookup

CVE-2026-55209 (GCVE-0-2026-55209)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:52 – Updated: 2026-09-14 20:11

Title

resdata insufficiently validates untrusted GRDECL files

Summary

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 20:10 UTC

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

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/equinor/resdata/security/advis…	x_refsource_CONFIRM
https://github.com/equinor/resdata/pull/1166	x_refsource_MISC
https://github.com/equinor/resdata/commit/9f8fd6d…	x_refsource_MISC
https://github.com/equinor/resdata/commit/d3f4582…	x_refsource_MISC
https://github.com/equinor/resdata/commit/ee8cc12…	x_refsource_MISC
https://github.com/equinor/resdata/releases/tag/6.2.9	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
equinor	resdata	Affected: < 6.2.9	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-55209

Vulnerability from fkie_nvd - Published: 2026-09-14 20:16 - Updated: 2026-09-14 21:17

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/equinor/resdata/commit/9f8fd6db472e0696080b768389914d60a453904f
	security-advisories@github.com	https://github.com/equinor/resdata/commit/d3f45828e9413506b8e8160a9304f4b7b06dcefc
	security-advisories@github.com	https://github.com/equinor/resdata/commit/ee8cc12b026d945df3077bc98e211ee45f80a433
	security-advisories@github.com	https://github.com/equinor/resdata/pull/1166
	security-advisories@github.com	https://github.com/equinor/resdata/releases/tag/6.2.9
	security-advisories@github.com	https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "resdata",
          "vendor": "equinor",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.2.9"
            }
          ]
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      ],
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  ],
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      "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."
    }
  ],
  "id": "CVE-2026-55209",
  "lastModified": "2026-09-14T21:17:13.457",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
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          "privilegesRequired": "NONE",
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          "version": "3.1"
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        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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    "ssvcV203": [
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      "url": "https://github.com/equinor/resdata/releases/tag/6.2.9"
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  "weaknesses": [
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        },
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          "value": "CWE-125"
        },
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          "value": "CWE-129"
        },
        {
          "lang": "en",
          "value": "CWE-476"
        }
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      "type": "Secondary"
    }
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}

GHSA-PR85-W493-9W3X

Vulnerability from github – Published: 2026-08-18 20:11 – Updated: 2026-08-18 20:11

Summary

resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read

Details

Impact

Prior to version 6.2.9 resdata would not correctly validate input in GRDECL files. The severity rating assumes that resdata is used to parse untrused files in a networking context such as a webservice.

Patches

The bug has been patched starting with version 6.2.9.

Severity

9.8 (Critical)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "resdata"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55209"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120",
      "CWE-125",
      "CWE-129",
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-18T20:11:04Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Impact\nPrior to version 6.2.9 resdata would not correctly validate input in GRDECL files. The severity rating assumes that resdata is used to parse untrused files in a networking context such as a webservice.\n\n### Patches\nThe bug has been patched starting with version 6.2.9.",
  "id": "GHSA-pr85-w493-9w3x",
  "modified": "2026-08-18T20:11:04Z",
  "published": "2026-08-18T20:11:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/equinor/resdata"
    },
    {
      "type": "WEB",
      "url": "https://github.com/equinor/resdata/releases/tag/6.2.9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read"
}

PYSEC-2026-3694

Vulnerability from pysec - Published: 2026-08-19 11:56 - Updated: 2026-08-19 12:16

Details

Impact

Patches

The bug has been patched starting with version 6.2.9.

Severity

9.8 (Critical)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impacted products

Name	purl
resdata	pkg:pypi/resdata

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "resdata",
        "purl": "pkg:pypi/resdata"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.1",
        "4.0.0",
        "4.1.0",
        "4.1.1",
        "4.1.2",
        "4.2.0",
        "4.2.1",
        "4.2.2",
        "4.2.3",
        "4.2.4",
        "5.0.0",
        "5.0.0b0",
        "5.0.1",
        "5.0.2",
        "5.0.3",
        "5.1.0",
        "5.1.1",
        "5.1.2",
        "5.1.3",
        "6.0.1",
        "6.1.0",
        "6.2.0",
        "6.2.2",
        "6.2.3",
        "6.2.4",
        "6.2.5",
        "6.2.6",
        "6.2.7",
        "6.2.8"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55209",
    "GHSA-pr85-w493-9w3x"
  ],
  "details": "### Impact\nPrior to version 6.2.9 resdata would not correctly validate input in GRDECL files. The severity rating assumes that resdata is used to parse untrused files in a networking context such as a webservice.\n\n### Patches\nThe bug has been patched starting with version 6.2.9.",
  "id": "PYSEC-2026-3694",
  "modified": "2026-08-19T12:16:38.889157Z",
  "published": "2026-08-19T11:56:27.903833Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/equinor/resdata"
    },
    {
      "type": "WEB",
      "url": "https://github.com/equinor/resdata/releases/tag/6.2.9"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/resdata"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-pr85-w493-9w3x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55209"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-55209 (GCVE-0-2026-55209)

FKIE_CVE-2026-55209

GHSA-PR85-W493-9W3X

Impact

Patches

PYSEC-2026-3694

Impact

Patches

Tags

Sightings

Nomenclature