CVE-2026-55209: resdata has Classic Buffer Overflow, Improper Validation of Array Index, NULL Pointer Dereference and Out-of-bounds Read

August 18, 2026

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.

References

github.com/advisories/GHSA-pr85-w493-9w3x
github.com/equinor/resdata/releases/tag/6.2.9
github.com/equinor/resdata/security/advisories/GHSA-pr85-w493-9w3x
nvd.nist.gov/vuln/detail/CVE-2026-55209

Code Behaviors & Features

Detect and mitigate CVE-2026-55209 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →