CVE-2026-3408 PUBLISHED

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.

• Oneafter (VulDB User) reporter

• VDB-348303 | Open Babel CDXML File atom.cpp GetExplicitValence null pointer dereference
• VDB-348303 | CTI Indicators (IOB, IOC, IOA)
• Submit #763756 | openbabel Open Babel 3.1.1 and master-branch NULL Pointer Dereference
• https://github.com/openbabel/openbabel/issues/2848
• https://github.com/openbabel/openbabel/pull/2862
• https://github.com/oneafter/0128/blob/main/ob3/repro.cdxml
• https://github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a

• NULL Pointer Dereference CWE
• Denial of Service CWE