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bdu:2025-14407

EUVD-2026-253580

fkie_cve-2025-10997

A flaw has been found in Open Babel up to 3.1.1. Impacted is the function ChemKinFormat::CheckSpecies of the file /src/formats/chemkinformat.cpp. Executing manipulation can lead to heap-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used.

GHSA-8wq6-qh76-wpv9 — Open Babel has heap buffer overflow in ChemKin ChemKinFormat::CheckSpecies

Affected: PyPI: openbabel

### 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.

openSUSE-SU-2026:21190-1 — Security update for openbabel

Security update for openbabel

PYSEC-2026-2778 — Open Babel has heap buffer overflow in ChemKin ChemKinFormat::CheckSpecies