NULL pointer dereference in Openbabel Open Babel
CVE-2026-3408
A vulnerability was identified in Open Babel up to 3.1.1. This impacts the function OBAtom::GetExplicitValence of the file isrc/atom.cpp of the component CDXML File Handler. Such manipulation leads to null pointer dereference. The attack can be launched remotely. The exploit is publicly available and might be used. The name of the patch is e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a. It is best practice to apply a patch to resolve this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Openbabel Open Babel
- Open Babel — versions 3.1.0, 3.1.1
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/openbabel/openbabel/issues/2848 (issue-tracking, Exploit, Issue Tracking)
- github.com/openbabel/openbabel/pull/2862 (issue-tracking, patch, Issue Tracking)
- github.com/oneafter/0128/blob/main/ob3/repro.cdxml (exploit, Issue Tracking)
- github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa0… (Patch, patch)
Frequently asked questions
- What is CVE-2026-3408?
- CVE-2026-3408 is a medium-severity vulnerability in Openbabel Open Babel, classified under Improper Resource Shutdown or Release. CVSS score: 4.3/10. Published 2026-03-02.
- How severe is CVE-2026-3408?
- Medium severity. CVSS v3 base score is 4.3 out of 10.