{"id":"PYSEC-2026-2776","summary":"Open Babel has out-of-bounds write (overlapping memcpy) in zipstream basic_unzip_streambuf::underflow","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.","aliases":["CVE-2025-10995","GHSA-8j3x-m868-cpw8"],"modified":"2026-07-13T16:32:07.091505955Z","published":"2026-07-13T15:46:25.510957Z","references":[{"type":"WEB","url":"https://github.com/openbabel/openbabel/security/advisories/GHSA-8j3x-m868-cpw8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-10995"},{"type":"WEB","url":"https://github.com/openbabel/openbabel/issues/2832"},{"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"},{"type":"WEB","url":"https://github.com/user-attachments/files/22318572/poc.zip"},{"type":"WEB","url":"https://vuldb.com/?ctiid.325923"},{"type":"WEB","url":"https://vuldb.com/?id.325923"},{"type":"WEB","url":"https://vuldb.com/?submit.654059"},{"type":"PACKAGE","url":"https://pypi.org/project/openbabel"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-8j3x-m868-cpw8"}],"affected":[{"package":{"name":"openbabel","ecosystem":"PyPI","purl":"pkg:pypi/openbabel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0"}]}],"versions":["1.8","1.8.1","1.8.2","1.8.3","1.8.4","2.4.0","2.4.1","3.0.0","3.0.0a1","3.1.1","3.1.1.1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/openbabel/PYSEC-2026-2776.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"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"}]}