Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- Medium severity, with a CVSS score of 5.3, published 26 September 2025.
- Which products and versions are affected?
- openbabel (PyPI) < 3.2.0.
- Is there a fix for This vulnerability?
- A patch was published on 2026-06-30: Version 3.2.0 released to address the issue Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is This vulnerability attacked?
- It is attacked with local access, in a software library.
- Am I affected?
- Check whether you run openbabel (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An out-of-bounds write vulnerability exists in Open Babel versions up to 3.1.1 within the `zlib_stream::basic_unzip_streambuf::underflow` function in `src/zipstreamimpl.h`. The issue stems from the use of `memcpy` on overlapping memory regions, which is undefined behavior and leads to memory corruption. An attacker can trigger this by providing a malformed input file that is processed by the library's zipstream implementation. While the attack requires local access to provide the malicious file, successful exploitation can result in a crash (DoS) or potentially arbitrary code execution. The vulnerability was identified via fuzzing and is addressed in version 3.2.0.
Affected products
- Open Babel Open Babel <= 3.1.1
Timeline
- 2025-09-14: disclosed: Issue reported on GitHub with PoC
- 2025-09-26: advisory: Initial GHSA and NVD publication
- 2026-06-30: patched: Version 3.2.0 released to address the issue