PT-2026-55112 · 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 ChemKin parser caused a heap buffer overflow when reading a crafted input file.

Details

The flaw was in ChemKinFormat::CheckSpecies. A malformed species record caused the parser to write past the end of a heap-allocated buffer.

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 ChemKin 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/af4a4212 Originally reported as #2830; fixes consolidated in #2913.

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 via OSS-Fuzz.

Exploit

Fix

Heap Based Buffer Overflow

Buffer Overflow

Weakness Enumeration

CWE-122

CWE-119

Related Identifiers

GHSA-8WQ6-QH76-WPV9

Affected Products

Open Babel

References · 9

• 🔥❌ https://github.com/user-attachments/files/22318543/poc.zip · Exploit, Deleted
• https://nvd.nist.gov/vuln/detail/CVE-2025-10997 · Security Note
• https://osv.dev/vulnerability/GHSA-8wq6-qh76-wpv9 · Vendor Advisory
• https://github.com/openbabel/openbabel · Note
• https://github.com/openbabel/openbabel/security/advisories/GHSA-8wq6-qh76-wpv9 · Note
• https://github.com/openbabel/openbabel/issues/2830 · Note
• https://vuldb.com/?id.325925 · Note
• https://vuldb.com/?submit.654062 · Note
• https://vuldb.com/?ctiid.325925 · Note