GHSA-pp85-5j63-xpq3 Open Babel has Use-after-free in GAMESS GAMESSOutputFormat::ReadMolecule

• PyPI openbabel: < 3.2.0 → fixed in 3.2.0

Summary A memory-safety vulnerability in Open Babel's GAMESS output parser caused a use-after-free when reading a crafted input file. Details The flaw was in `GAMESSOutputFormat::ReadMolecule`. A malformed input caused the parser to dereference a stale pointer after the underlying object had been freed. 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 GAMESS output 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/95033d27 Originally reported as #2834; 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.