CVE-2025-11000Medium· 4.4▾ SunlitOpen Babel has out-of-bounds read in PQS lowerit (pre-buffer read)
▾ Sunlit zone — Low / medium · no exploitation signal
impact 24.2 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.2%
0.2% → 0.2%
A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file.
The flaw was in the lowerit helper used by the PQS parser. A
malformed input caused the helper to read one or more bytes before
the start of its input 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 PQS 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/f4a5ebae 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.
Reported via OSS-Fuzz.
openbabel < 3.2.0Upgrade to a patched release:
openbabel 3.2.0Connected by shared product, vendor, weakness, or advisory.
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