{"id":"CVE-2025-10995","aliases":["GHSA-8j3x-m868-cpw8","PYSEC-2026-2776"],"url":"https://o3.security/vulnerability/CVE-2025-10995","summary":"Open Babel zipstreamimpl.h underflow memory corruption","details":"### Summary\n\nA memory-safety vulnerability in Open Babel's bundled zipstream\ndecompression code caused an out-of-bounds write via overlapping\n`memcpy` when reading a crafted gzip-compressed chemistry file.\n\n### Details\n\nThe flaw was in `basic_unzip_streambuf::underflow`. The decompression\nbuffer refill path invoked `memcpy` with overlapping source and\ndestination regions, which is undefined behavior and produced\nout-of-bounds writes in practice. Any file format read through the\ngzip-wrapped reader was a potential trigger.\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 gzip-compressed chemistry file\nwith the `obabel` tool, the `OBConversion` API, or any of the language\nbindings (Python, Ruby, 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/d4621d41\nOriginally reported as #2832; fixes consolidated in #2913.\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 via OSS-Fuzz.","published":"2025-09-26T02:02:10.346Z","modified":"2026-08-12T03:51:47.333043151Z","cvss":null,"epss":{"score":0.00252,"percentile":0.1685,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"openbabel","fixedVersion":"3.2.0"}],"fix":{"url":"https://github.com/openbabel/openbabel/commit/d4621d417c167b50cc8ce7aa3a02557e5b2b81c5","label":"openbabel/openbabel@d4621d4"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/10xxx/CVE-2025-10995.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-10995"},{"type":"ADVISORY","url":"https://vuldb.com/?id.325923"},{"type":"ADVISORY","url":"https://vuldb.com/?submit.654059"},{"type":"REPORT","url":"https://github.com/openbabel/openbabel/issues/2832"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.325923"},{"type":"EVIDENCE","url":"https://github.com/user-attachments/files/22318572/poc.zip"},{"type":"WEB","url":"https://github.com/openbabel/openbabel/security/advisories/GHSA-8j3x-m868-cpw8"},{"type":"WEB","url":"https://github.com/openbabel/openbabel/issues/2913"},{"type":"WEB","url":"https://github.com/openbabel/openbabel/commit/d4621d417c167b50cc8ce7aa3a02557e5b2b81c5"},{"type":"PACKAGE","url":"https://github.com/openbabel/openbabel"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:47.333043151Z"}}