| Package | Affected versions | Patched versions |
|---|---|---|
| openbabel | < 3.2.0 | 3.2.0 |
| open babel | ≤ 3.1.1 |
A memory-safety vulnerability in Open Babel's CDXML file format parser caused a NULL pointer dereference when reading a crafted input file.
The flaw was in OBAtom::GetExplicitValence as called from the CDXML
parser. A malformed fragment caused the parser to invoke the method
on a NULL atom pointer.
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 CDXML file with the obabel
tool, the OBConversion API, or any of the language bindings (Python,
Ruby, Java, R, Perl, C#, PHP).
All releases up to and including 3.1.1.
3.2.0 (released 2026-05-26).
Fix commit: https://github.com/openbabel/openbabel/commit/e23a224b Tracked in #2862.
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.
Reported by Vedant Madane (@VedantMadane) via VulDB.
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