### Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file. ### Details 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. ### Impact 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). ### Affected versions All releases up to and including 3.1.1. ### Patched version 3.2.0 (released 2026-05-26). ### Patch 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. ### Credit Reported via OSS-Fuzz.
### Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file. ### Details 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. ### Impact 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). ### Affected versions All releases up to and including 3.1.1. ### Patched version 3.2.0 (released 2026-05-26). ### Patch 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. ### Credit Reported via OSS-Fuzz.
### Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file. ### Details 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. ### Impact 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). ### Affected versions All releases up to and including 3.1.1. ### Patched version 3.2.0 (released 2026-05-26). ### Patch 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. ### Credit Reported via OSS-Fuzz.
### Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file. ### Details 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. ### Impact 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). ### Affected versions All releases up to and including 3.1.1. ### Patched version 3.2.0 (released 2026-05-26). ### Patch 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. ### Credit Reported via OSS-Fuzz.
Update openbabel to 3.2.0 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanOpen Babel has out-of-bounds read in PQS lowerit (pre-buffer read) affects openbabel (pip). Severity is medium. ### Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file. ### Details 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. ### Impact 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). ### Affected versions All releases up to and including 3.1.1. ### Patched version 3.2.0 (released 2026-05-26). ### Patch 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. ### Credit Reported via OSS-Fuzz.
AI coding agents often install or upgrade packages automatically in pip. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| openbabelpip | <3.2.0 | 3.2.0 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardUpdate openbabel to 3.2.0 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanOpen Babel has out-of-bounds read in PQS lowerit (pre-buffer read) affects openbabel (pip). Severity is medium. ### Summary A memory-safety vulnerability in Open Babel's PQS parser caused an out-of-bounds (pre-buffer) read when reading a crafted input file. ### Details 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. ### Impact 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). ### Affected versions All releases up to and including 3.1.1. ### Patched version 3.2.0 (released 2026-05-26). ### Patch 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. ### Credit Reported via OSS-Fuzz.
AI coding agents often install or upgrade packages automatically in pip. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| openbabelpip | <3.2.0 | 3.2.0 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard