PYSEC-2026-2785

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/openbabel/PYSEC-2026-2785.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-2785
Aliases
Published
2026-07-13T15:46:25.809413Z
Modified
2026-07-13T16:32:25.851811128Z
Severity
  • 4.4 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L CVSS Calculator
Summary
Open Babel has out-of-bounds read in PQS lowerit (pre-buffer read)
Details

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.

References

Affected packages

PyPI / openbabel

Package

Name
openbabel
View open source insights on deps.dev
Purl
pkg:pypi/openbabel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.2.0

Affected versions

1.*
1.8
1.8.1
1.8.2
1.8.3
1.8.4
2.*
2.4.0
2.4.1
3.*
3.0.0a1
3.0.0
3.1.1
3.1.1.1

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/openbabel/PYSEC-2026-2785.yaml"