{"id":"CVE-2026-2704","aliases":["GHSA-6xw4-2g22-26h8","PYSEC-2026-2774"],"url":"https://o3.security/vulnerability/CVE-2026-2704","summary":"Open Babel CIF File transform3d.cpp DescribeAsString out-of-bounds","details":"> ### Summary\n>\n> A memory-safety vulnerability in Open Babel's CIF file format parser\n> allowed an out-of-bounds read when reading a crafted input file.\n>\n> ### Details\n>\n> The flaw was in `OpenBabel::transform3d::DescribeAsString`. A malformed\n> symmetry-operation string caused the parser to read past the end of its\n> internal buffer while formatting the description.\n>\n> ### Impact\n>\n> Open Babel is a C++ library and CLI used to read and write chemistry\n> file formats; it is shipped by Linux distributions and embedded in\n> services that may parse untrusted input. Triggering this vulnerability\n> requires the victim to open a malicious CIF file with the `obabel`\n> tool, the OBConversion API, or any of the language bindings.\n>\n> ### Affected versions\n>\n> All releases up to and including 3.1.1.\n>\n> ### Patched version\n>\n> 3.2.0 (released 2026-05-26).\n>\n> ### Patch\n>\n> Fix commit: https://github.com/openbabel/openbabel/commit/e23a224b\n> Tracked in #2862.\n>\n> A minimized reproducer for this CVE is checked in at\n> `test/files/fuzz_regress/cve-2026-2704.cif` and is exercised on every\n> CI build under ASAN+UBSAN by the `fuzzregresstest` harness.\n>\n> ### Credit\n>\n> Reported by Vedant Madane (@VedantMadane).","published":"2026-02-19T04:32:07.297Z","modified":"2026-10-21T09:50:02.205360047Z","cvss":null,"epss":{"score":0.00759,"percentile":0.53244,"asOf":"2026-09-13"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"openbabel","fixedVersion":"3.2.0"}],"fix":{"url":"https://github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a","label":"VedantMadane/openbabel@e23a224"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2704.json"},{"type":"ADVISORY","url":"https://github.com/openbabel/openbabel/security/advisories/GHSA-6xw4-2g22-26h8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2704"},{"type":"ADVISORY","url":"https://vuldb.com/submit/754378"},{"type":"ADVISORY","url":"https://vuldb.com/vuln/346650"},{"type":"REPORT","url":"https://github.com/openbabel/openbabel/issues/2848"},{"type":"REPORT","url":"https://vuldb.com/vuln/346650/cti"},{"type":"FIX","url":"https://github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a"},{"type":"FIX","url":"https://github.com/openbabel/openbabel/pull/2862"},{"type":"FIX","url":"https://github.com/openbabel/openbabel/releases/tag/openbabel-3-2-0"},{"type":"EVIDENCE","url":"https://github.com/oneafter/0128/blob/main/ob1/repro.cif"},{"type":"PACKAGE","url":"https://github.com/openbabel/openbabel"},{"type":"WEB","url":"https://vuldb.com/?ctiid.346650"},{"type":"WEB","url":"https://vuldb.com/?id.346650"},{"type":"WEB","url":"https://vuldb.com/?submit.754378"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T09:50:02.205360047Z"}}