CVE-2026-3408: Open Babel CDXML File atom.cpp GetExplicitValence null pointer dereference

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-02 · updated 2026-06-17
Weakness: CWE-404

Description

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.

Affected products

Open Babel: through 3.1.1

References

https://github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a
https://github.com/oneafter/0128/blob/main/ob3/repro.cdxml
https://github.com/openbabel/openbabel/issues/2848
https://github.com/openbabel/openbabel/pull/2862
https://vuldb.com/?ctiid.348303
https://vuldb.com/?id.348303
https://vuldb.com/?submit.763756

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