PYSEC-2026-2770
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/openbabel/PYSEC-2026-2770.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-2770
- Aliases
- Published
- 2026-07-13T15:46:25.339609Z
- Modified
- 2026-07-13T16:32:05.741598270Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
- 2.1 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
- Summary
- Open Babel has NULL pointer dereference in MOL2 OBAtom::SetFormalCharge
- Details
-
Summary
A memory-safety vulnerability in Open Babel's MOL2 file format parser caused a NULL pointer dereference when reading a crafted input file.
Details
The flaw was in
OBAtom::SetFormalChargeas called from the MOL2 parser. A malformed atom record caused the parser to call the method on a NULL atom pointer.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 MOL2 file with the
obabeltool, theOBConversionAPI, 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/e23a224b Tracked in #2862.
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 thefuzzregresstestharness.Credit
Reported by Vedant Madane (@VedantMadane) via VulDB.
- References
-
- https://github.com/openbabel/openbabel/security/advisories/GHSA-4w5w-4fhm-q483
- https://nvd.nist.gov/vuln/detail/CVE-2026-2705
- https://github.com/openbabel/openbabel/issues/2848
- https://github.com/openbabel/openbabel/pull/2862
- https://github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a
- https://github.com/oneafter/0128/blob/main/ob2/repro.mol2
- https://github.com/openbabel/openbabel
- https://vuldb.com/?ctiid.346651
- https://vuldb.com/?id.346651
- https://vuldb.com/?submit.754379
- https://pypi.org/project/openbabel
- https://github.com/advisories/GHSA-4w5w-4fhm-q483
Affected packages
PyPI / openbabel
Package
- Name
- openbabel
- View open source insights on deps.dev
- Purl
- pkg:pypi/openbabel