PT-2026-55138 · Pypi · Open Babel

Published 2026-07-01 · Updated 2026-07-01

OSV

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

A memory-safety vulnerability in Open Babel's MSI parser caused an uninitialized pointer dereference when reading a crafted input file.

Details

The flaw was in the atom handling of the MSI reader. A malformed record caused the parser to dereference an atom pointer that had never been initialized.

Impact

Open Babel is a C++ library and CLI used to read and write chemistry file formats; it is shipped by Linux distributions and embedded in services that may parse untrusted input. Triggering this vulnerability requires the victim to open a malicious MSI file with the obabel tool, the OBConversion API, or any of the language bindings (Python, Ruby, Java, R, Perl, C#, PHP).

Affected versions

All releases up to and including 3.1.1.

Patched version

3.2.0 (released 2026-05-26).

Patch

Fix commit: https://github.com/openbabel/openbabel/commit/fa9a2d9a

A minimized reproducer for this CVE is checked in under test/files/fuzz regress/ and is exercised on every CI build under ASAN+UBSAN by the fuzzregresstest harness.

Credit

Reported by Cisco TALOS.

Fix

Access of Uninitialized Pointer

Weakness Enumeration

CWE-824

Related Identifiers

GHSA-JR2X-6QF6-Q5MC

Affected Products

Open Babel

References · 6

• https://osv.dev/vulnerability/GHSA-jr2x-6qf6-q5mc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-44451 · Security Note
• https://github.com/openbabel/openbabel · Note
• https://github.com/openbabel/openbabel/commit/fa9a2d9a2eb75154b7a884dfe679ff41a8f9c547 · Note
• https://github.com/openbabel/openbabel/security/advisories/GHSA-jr2x-6qf6-q5mc · Note
• https://talosintelligence.com/vulnerability_reports/TALOS-2022-1669 · Note