This release reflects the latest stable version, including many bug fixes, including some potentially security related.

As noted with our 3.2.0 release, we anticipate further bug-fix releases over the course of 2026 and appreciate the many contributions and reports from everyone.

🪲 Bug Fixes

• Fix tetrazole protonation handling in the pH model by @Jnelen in #2975
• ChemDraw CDX: handle additional aromatic/fractional bond-order codes by @jlkjr in #2979

🔒 Security and Hardening

• Fix CVE-2026-54751: MMD parser uninitialized value use can expose prior atom data by Carmelo Lin @Carmel0
• Update SECURITY.md with GitHub Security Advisory links by @ghutchis in #2968
• Fix several formats with sscanf validation by @ghutchis in #2973
• Fix more fuzz bugs by @ghutchis in #2977
• Fix stack overflow in gaussformat and cube by @ghutchis in #2985
• Fix additional crashes from fuzz testing by @ghutchis in #2986
• Fix more reported crashes by @ghutchis in #2988
• Fix integer overflow issues by @ghutchis in #2989
• Fix more bug / crash reports by @ghutchis in #2990
• Fix more crash / fuzz reports by @ghutchis in #2991

Credits to:

• Carmelo Lin @Carmel0
• @cybershubham06
• @Pig-Tail
• @manus-use
• @damseleng

🛠️ Build Changes

• For now, modify build wheels to take an explicit version number by @ghutchis in #2963
• CMake: Don't look for wxWidgets unless the GUI is requested by @berquist in #2964
• refactor: remove MIN and MAX macros by @e-kwsm in #2970
• fix bindings_php build issues by @e-kwsm in #2971
• build(python): write _openbabel.so under build directory instead of source directory by @e-kwsm in #2974
• Fix headers with system InChi by @PPN-SD in #2969
• build(plugin_descriptors): properly set the include directory of InChI by @e-kwsm in #2982
• chore: update downloads badge, from SF to GH [skip ci] by @e-kwsm in #2966
• docs: fix PAPER_TYPE and configure PROJECT_NUMBER by @e-kwsm in #2981
• Parse openbabel-x-y-z tags for version numbers by @ghutchis in #2967

New Contributors

• @berquist made their first contribution in #2964
• @Jnelen made their first contribution in #2975
• @jlkjr made their first contribution in #2979

Full Changelog: openbabel-3-2-0...openbabel-3-2-1