Open Babel has out-of-bounds write in MSI translationVectors[]

SummaryA memory-safety vulnerability in Open Babel's MSI parser allowed anout-of-bounds write into the translationVectors array whenreading a crafted input file. DetailsThe MSI reader stored cell translation vectors into a fixed-sizetranslationVectors array. A malformed input could push morevecto...

Open Babel has uninitialized pointer dereference in GRO residue parser

SummaryA memory-safety vulnerability in Open Babel's GRO parser caused anuninitialized pointer dereference when reading a crafted input file. DetailsThe flaw was in the residue handling of the GRO reader. A malformedrecord caused the parser to use a residue pointer that had never beeninitialized...

PYSEC-2026-2780 Open Babel has out-of-bounds write in MSI translationVectors[]

Summary A memory-safety vulnerability in Open Babel's MSI parser allowed an out-of-bounds write into the translationVectors array when reading a crafted input file. Details The MSI reader stored cell translation vectors into a fixed-size translationVectors array. A malformed input could push more...

PYSEC-2026-2783 Open Babel has out-of-bounds write in Gaussian translationVectors[]

Summary A memory-safety vulnerability in Open Babel's Gaussian output parser allowed an out-of-bounds write into the translationVectors array when reading a crafted input file. Details The Gaussian reader stored periodic-cell translation vectors into a fixed-size translationVectors array. A...

PYSEC-2026-2787 Open Babel has uninitialized pointer dereference in GRO residue parser

Summary A memory-safety vulnerability in Open Babel's GRO parser caused an uninitialized pointer dereference when reading a crafted input file. Details The flaw was in the residue handling of the GRO reader. A malformed record caused the parser to use a residue pointer that had never been...

Open Babel has out-of-bounds write in MOL2 attribute/value parser

SummaryA memory-safety vulnerability in Open Babel's MOL2 parser allowed anout-of-bounds write when reading a crafted input file. DetailsThe flaw was in the attribute/value parsing path of the MOL2 reader.An over-long attribute or value caused the parser to write past theend of a fixed-size...

Open Babel has out-of-bounds write in ORCA nAtoms parser

SummaryA memory-safety vulnerability in Open Babel's ORCA parser allowed anout-of-bounds write when reading a crafted input file. DetailsThe flaw was in the nAtoms handling of the ORCA reader. A malformedinput caused the parser to write past the end of its destinationbuffer. ImpactOpen Babel is a...

Open Babel has uninitialized pointer dereference in MSI atom parser

SummaryA memory-safety vulnerability in Open Babel's MSI parser caused anuninitialized pointer dereference when reading a crafted input file. DetailsThe flaw was in the atom handling of the MSI reader. A malformedrecord caused the parser to dereference an atom pointer that hadnever been...

Open Babel has out-of-bounds write in MOPAC translationVectors[] (FINAL POINT)

SummaryA memory-safety vulnerability in Open Babel's MOPAC output parserallowed an out-of-bounds write into the translationVectors arraywhen reading the "FINAL POINT" block of a crafted input file. DetailsThe MOPAC output reader stored translation vectors from the FINALPOINT block into a fixed-si...

Open Babel has out-of-bounds write in Gaussian coords_type orientation parser

SummaryA memory-safety vulnerability in Open Babel's Gaussian output parserallowed an out-of-bounds write when reading a crafted input file. DetailsThe flaw was in the coordstype orientation parser inside theGaussian output reader. A malformed orientation block caused theparser to write past the...

Open Babel has a NULL pointer dereference in CDXML OBAtom::GetExplicitValence

SummaryA memory-safety vulnerability in Open Babel's CDXML file format parsercaused a NULL pointer dereference when reading a crafted input file. DetailsThe flaw was in OBAtom::GetExplicitValence as called from the CDXMLparser. A malformed fragment caused the parser to invoke the methodon a NULL...

Open Babel has NULL pointer dereference in ChemKinFormat::ReadReactionQualifierLines

SummaryA memory-safety vulnerability in Open Babel's ChemKin parser causeda NULL pointer dereference when reading a crafted input file. DetailsThe flaw was in ChemKinFormat::ReadReactionQualifierLines. Amalformed reaction qualifier record caused the parser to dereferencea NULL pointer. ImpactOpen...

Open Babel has out-of-bounds write in CSR PadString (title field)

SummaryA memory-safety vulnerability in Open Babel's CSR parser allowed anout-of-bounds write when reading a crafted input file. DetailsThe flaw was in the PadString helper used to handle the CSR titlefield. A title longer than the fixed destination buffer caused theparser to write past the end o...

PYSEC-2026-2778 Open Babel has heap buffer overflow in ChemKin ChemKinFormat::CheckSpecies

Summary A memory-safety vulnerability in Open Babel's ChemKin parser caused a heap buffer overflow when reading a crafted input file. Details The flaw was in ChemKinFormat::CheckSpecies. A malformed species record caused the parser to write past the end of a heap-allocated buffer. Impact Open Bab...

Open Babel has out-of-bounds write (overlapping memcpy) in zipstream basic_unzip_streambuf::underflow

SummaryA memory-safety vulnerability in Open Babel's bundled zipstreamdecompression code caused an out-of-bounds write via overlappingmemcpy when reading a crafted gzip-compressed chemistry file. DetailsThe flaw was in basicunzipstreambuf::underflow. The decompressionbuffer refill path invoked...

PYSEC-2026-2774 Open Babel has an out-of-bounds read in CIF transform3d::DescribeAsString

Summary A memory-safety vulnerability in Open Babel's CIF file format parser allowed an out-of-bounds read when reading a crafted input file. Details The flaw was in OpenBabel::transform3d::DescribeAsString. A malformed symmetry-operation string caused the parser to read past the end of its...

Open Babel has heap buffer overflow in SMILES OBSmilesParser::ParseSmiles

SummaryA memory-safety vulnerability in Open Babel's SMILES parser caused aheap buffer overflow when reading a crafted input string. DetailsThe flaw was in OBSmilesParser::ParseSmiles. A malformed SMILESinput caused the parser to write past the end of a heap-allocatedbuffer. ImpactOpen Babel is a...

PYSEC-2026-2781 Open Babel has heap buffer overflow in SMILES OBSmilesParser::ParseSmiles

Summary A memory-safety vulnerability in Open Babel's SMILES parser caused a heap buffer overflow when reading a crafted input string. Details The flaw was in OBSmilesParser::ParseSmiles. A malformed SMILES input caused the parser to write past the end of a heap-allocated buffer. Impact Open Babe...

PYSEC-2026-2788 Open Babel has out-of-bounds write in CSR PadString (title field)

Summary A memory-safety vulnerability in Open Babel's CSR parser allowed an out-of-bounds write when reading a crafted input file. Details The flaw was in the PadString helper used to handle the CSR title field. A title longer than the fixed destination buffer caused the parser to write past the...

PYSEC-2026-2791 Open Babel has a NULL pointer dereference in CDXML OBAtom::GetExplicitValence

Summary A memory-safety vulnerability in Open Babel's CDXML file format parser caused a NULL pointer dereference when reading a crafted input file. Details The flaw was in OBAtom::GetExplicitValence as called from the CDXML parser. A malformed fragment caused the parser to invoke the method on a...