low

CVE-2026-2704

PyPI · openbabel

Summary

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

Severity
low
CVSS
4.4
EPSS
0.8% (p53)
CWE
CWE-119, CWE-125
Also known as
GHSA-6xw4-2g22-26h8
Published
2026-06-30
Updated
2026-06-30

Advisory details

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 internal buffer while formatting the description.

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 CIF file with the obabel tool, the OBConversion API, or any of the language bindings.

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 at test/files/fuzz_regress/cve-2026-2704.cif and is exercised on every CI build under ASAN+UBSAN by the fuzzregresstest harness.

Credit

Reported by Vedant Madane (@VedantMadane).

References

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.