CRITICAL 9.8

PYSEC-2026-3694

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

Quick fix

PYSEC-2026-3694 — resdata: upgrade to the fixed version with the command below.

pip install --upgrade 'resdata>=6.2.9'

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / resdata

Introduced in: 0 Fixed in: 6.2.9

Fix pip install --upgrade 'resdata>=6.2.9'

References

https://github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x [WEB]
https://github.com/equinor/resdata [PACKAGE]
https://github.com/equinor/resdata/releases/tag/6.2.9 [WEB]
https://pypi.org/project/resdata [PACKAGE]
https://github.com/advisories/GHSA-pr85-w493-9w3x [ADVISORY]
https://nvd.nist.gov/vuln/detail/CVE-2026-55209 [ADVISORY]