Quick answers
- Is CVE-2026-3408 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-3408 being exploited in the wild.
- How severe is CVE-2026-3408?
- Medium severity, with a CVSS score of 5.5, published 30 June 2026.
- Which products and versions are affected?
- openbabel (PyPI) < 3.2.0, ECOSYSTEM:introduced=0,fixed=3.2.0.
- Is there a fix for CVE-2026-3408?
- Yes. openbabel (PyPI): upgrade to 3.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-3408 attacked?
- It is attacked with local access, in a software library.
- Am I affected by CVE-2026-3408?
- Check whether you run openbabel (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- openbabel (PyPI): upgrade to 3.2.0 or later
pip install "openbabel>=3.2.0"
Technical details
A NULL pointer dereference exists in Open Babel's CDXML file format parser within the `OBAtom::GetExplicitValence` method. The vulnerability is triggered when the parser encounters a malformed fragment in a CDXML file, causing it to invoke the method on a NULL atom pointer. Exploitation requires a victim to open a malicious CDXML file using the `obabel` CLI tool, the `OBConversion` API, or any of its language bindings (e.g., Python, Java, C#). The issue is fixed in version 3.2.0.
Affected products
- Open Babel openbabel <= 3.1.1
Identifiers
- CVE-2026-3408
- GHSA-rxpr-wq63-jr7p
- PYSEC-2026-2791
Timeline
- 2026-05-26: patched: Version 3.2.0 released
- 2026-05-27: advisory: Initial GitHub Advisory published
- 2026-06-30: disclosed: Full advisory details published/updated