A memory-safety vulnerability in Open Babel's ORCA parser allowed an out-of-bounds write when reading a crafted input file.
A second variant of the nAtoms out-of-bounds write in the ORCA
reader: a different malformed-input path produced the same class of
write past the end of the destination buffer.
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 ORCA 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/b239d06e
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 Cisco TALOS.
1.81.8.11.8.21.8.31.8.42.4.02.4.13.0.03.0.0a13.1.1+1 more3.2.0Exploitability
AV:LAC:LPR:NUI:RScope
S:UImpact
C:HI:HA:HCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H