{"id":"CVE-2026-2705","title":"Open Babel has NULL pointer dereference in MOL2 OBAtom::SetFormalCharge","summary":"Open Babel has NULL pointer dereference in MOL2 OBAtom::SetFormalCharge","severity":"low","cvss":5.5,"cwe":["CWE-119","CWE-476"],"vendor":"openbabel","product":"openbabel","ecosystem":"pip","affected":["openbabel < 3.2.0"],"patched":["openbabel 3.2.0"],"published":"2026-06-30","updated":"2026-06-30","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-4w5w-4fhm-q483","references":[{"url":"https://github.com/openbabel/openbabel/security/advisories/GHSA-4w5w-4fhm-q483"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2705"},{"url":"https://github.com/openbabel/openbabel/issues/2848"},{"url":"https://github.com/openbabel/openbabel/pull/2862"},{"url":"https://github.com/VedantMadane/openbabel/commit/e23a224b8fd9d7c2a7cde9ef4ec6afb4c05aa08a"},{"url":"https://github.com/oneafter/0128/blob/main/ob2/repro.mol2"},{"url":"https://vuldb.com/?ctiid.346651"},{"url":"https://vuldb.com/?id.346651"},{"url":"https://vuldb.com/?submit.754379"},{"url":"https://github.com/advisories/GHSA-4w5w-4fhm-q483"}],"tags":["ghsa","pip"],"epss":0.00747,"epssPercentile":0.5294,"ingestedAt":"2026-06-30T21:24:14.386Z","slug":"CVE-2026-2705","body":"## Overview\n\n### Summary\n\nA memory-safety vulnerability in Open Babel's MOL2 file format parser\ncaused a NULL pointer dereference when reading a crafted input file.\n\n### Details\n\nThe flaw was in `OBAtom::SetFormalCharge` as called from the MOL2\nparser. A malformed atom record caused the parser to call the method\non a NULL atom pointer.\n\n### Impact\n\nOpen Babel is a C++ library and CLI used to read and write chemistry\nfile formats; it is shipped by Linux distributions and embedded in\nservices that may parse untrusted input. Triggering this vulnerability\nrequires the victim to open a malicious MOL2 file with the `obabel`\ntool, the `OBConversion` API, or any of the language bindings (Python,\nRuby, Java, R, Perl, C#, PHP).\n\n### Affected versions\n\nAll releases up to and including 3.1.1.\n\n### Patched version\n\n3.2.0 (released 2026-05-26).\n\n### Patch\n\nFix commit: https://github.com/openbabel/openbabel/commit/e23a224b\nTracked in #2862.\n\nA minimized reproducer for this CVE is checked in under\n`test/files/fuzz_regress/` and is exercised on every CI build under\nASAN+UBSAN by the `fuzzregresstest` harness.\n\n### Credit\n\nReported by Vedant Madane (@VedantMadane) via VulDB.\n\n## Affected packages\n\n- `openbabel < 3.2.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `openbabel 3.2.0`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}