PYSEC-2026-2789

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/openbabel/PYSEC-2026-2789.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-2789
Aliases
Published
2026-07-13T15:46:25.449170Z
Modified
2026-07-13T16:32:26.297892391Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • 1.9 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
Summary
Open Babel has Use-after-free in GAMESS GAMESSOutputFormat::ReadMolecule
Details

Summary

A memory-safety vulnerability in Open Babel's GAMESS output parser caused a use-after-free when reading a crafted input file.

Details

The flaw was in GAMESSOutputFormat::ReadMolecule. A malformed input caused the parser to dereference a stale pointer after the underlying object had been freed.

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 GAMESS output 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/95033d27 Originally reported as #2834; 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-2026-2789.yaml"