CVE-2026-3408 Open Babel CDXML File atom.cpp GetExplicitValence null pointer dereference
A remote attacker can cause a denial of service via null pointer dereference in Open Babel's CDXML file handler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-3408?
CVE-2026-3408 is a medium-severity vulnerability in Open Babel, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-3408?
3 open source packages ship an affected version, including openbabel. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
openbabel PyPI | All versions | 3.2.0 |
openbabel PyPI | All versions | 3.2.0 |
openbabel PyPI | All versions | 3.2.0 |
Products include Openbabel Open Babel.
How do I fix CVE-2026-3408?
Upgrade openbabel to 3.2.0 or later.
Is CVE-2026-3408 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3408 exists.
Other vulnerabilities in Open Babel
- CVE-2022-41793 Open Babel has out-of-bounds write in CSR PadString (title field)
- CVE-2022-42885 Open Babel has uninitialized pointer dereference in GRO residue parser
- CVE-2022-43467 Open Babel has out-of-bounds write in PQS coord_file parser
- CVE-2022-44451 Open Babel has uninitialized pointer dereference in MSI atom parser
- CVE-2022-46280 Open Babel has uninitialized pointer dereference in PQS pFormat
Sources
Also known as DEBIAN-CVE-2026-3408, GHSA-rxpr-wq63-jr7p, PYSEC-2026-2791, UBUNTU-CVE-2026-3408.