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CVE-2026-55209

CRITICAL

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

Published August 18, 2026Updated August 19, 2026Source: osv

Summary

### 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.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update resdata to 6.2.9 or later
pip install "resdata>=6.2.9"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

PackageEcosystemAffectedFixed In
resdata
pypi
3.0.1, 4.0.0, 4.1.0, 4.1.1 (+25 more)6.2.9

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2026-55209?
resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-55209?
CVE-2026-55209 affects resdata. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-55209 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-pr85-w493-9w3x
PYSEC-2026-3694

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