GHSA-8J3X-M868-CPW8
Vulnerability from github – Published: 2026-06-30 21:25 – Updated: 2026-06-30 21:25Summary
A memory-safety vulnerability in Open Babel's bundled zipstream
decompression code caused an out-of-bounds write via overlapping
memcpy when reading a crafted gzip-compressed chemistry file.
Details
The flaw was in basic_unzip_streambuf::underflow. The decompression
buffer refill path invoked memcpy with overlapping source and
destination regions, which is undefined behavior and produced
out-of-bounds writes in practice. Any file format read through the
gzip-wrapped reader was a potential trigger.
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 gzip-compressed chemistry file
with the obabel tool, the OBConversion API, or any of the language
bindings (Python, Ruby, Java, R, Perl, C#, PHP).
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/d4621d41 Originally reported as #2832; fixes consolidated in #2913.
A minimized reproducer for this CVE is checked in under
test/files/fuzz_regress/ and is exercised on every CI build under
ASAN+UBSAN by the fuzzregresstest harness.
Credit
Reported via OSS-Fuzz.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "openbabel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.2.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-10995"
],
"database_specific": {
"cwe_ids": [
"CWE-787"
],
"github_reviewed": true,
"github_reviewed_at": "2026-06-30T21:25:25Z",
"nvd_published_at": null,
"severity": "LOW"
},
"details": "### Summary\n\nA memory-safety vulnerability in Open Babel\u0027s 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.",
"id": "GHSA-8j3x-m868-cpw8",
"modified": "2026-06-30T21:25:25Z",
"published": "2026-06-30T21:25:25Z",
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"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",
"type": "CVSS_V4"
}
],
"summary": "Open Babel has out-of-bounds write (overlapping memcpy) in zipstream basic_unzip_streambuf::underflow"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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