GHSA-v4x9-3549-crwv

Suggest an improvement
Source
https://github.com/advisories/GHSA-v4x9-3549-crwv
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-v4x9-3549-crwv/GHSA-v4x9-3549-crwv.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-v4x9-3549-crwv
Aliases
Published
2026-10-05T23:47:10Z
Modified
2026-10-06T00:00:08Z
Severity
  • 8.4 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.5 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
PyMongo: PYTHON-5996 Heap out-of-bounds write via signed size overflow in BSON document encoding
Details

An integer overflow in the BSON document encoding component of the MongoDB Python Driver's bundled native extension may occur when a single document is built from an unusually large amount of caller-supplied data. Size arithmetic is performed in a signed 32-bit type, and the guard meant to catch the overflow is written in a form whose behavior is not defined by the C language standard. A party with no privileges who can place a very large value into data that an application encodes may, depending on how the native extension was built, cause a write outside the bounds of an allocated buffer inside the application's own process.

Database specific 
{
    "cwe_ids":  [
        "CWE-190"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-05T23:47:10Z",
    "nvd_published_at":  "2026-09-24T19:17:20Z",
    "severity":  "HIGH"
}
References

Affected packages

PyPI / pymongo

Package

Name
pymongo
View open source insights on deps.dev
Purl
pkg:pypi/pymongo

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.18.2

Affected versions

0.*
0.1pre
0.1.1pre
0.1.2pre
0.2pre
0.3pre
0.3.1pre
0.4pre
0.5pre
0.5.1pre
0.5.2pre
0.5.3pre
0.6
0.7
0.7.1
0.7.2
0.8
0.8.1
0.9
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.10
0.10.1
0.10.2
0.10.3
0.11
0.11.1
0.11.2
0.11.3
0.12
0.13
0.14
0.14.1
0.14.2
0.15
0.15.1
0.15.2
0.16
1.*
1.0
1.1
1.1.1
1.1.2
1.2
1.2.1
1.3
1.4
1.5
1.5.1
1.5.2
1.6
1.7
1.8
1.8.1
1.9
1.10
1.10.1
1.11
2.*
2.0
2.0.1
2.1
2.1.1
2.2
2.2.1
2.3
2.4
2.4.1
2.4.2
2.5
2.5.1
2.5.2
2.6
2.6.1
2.6.2
2.6.3
2.7
2.7.1
2.7.2
2.8
2.8.1
2.9
2.9.1
2.9.2
2.9.3
2.9.4
2.9.5
3.*
3.0
3.0.1
3.0.2
3.0.3
3.1
3.1.1
3.2
3.2.1
3.2.2
3.3.0
3.3.1
3.4.0
3.5.0
3.5.1
3.6.0
3.6.1
3.7.0
3.7.1
3.7.2
3.8.0
3.9.0
3.10.0
3.10.1
3.11.0
3.11.1
3.11.2
3.11.3
3.11.4
3.12.0
3.12.1
3.12.2
3.12.3
3.13.0
4.*
4.0
4.0.1
4.0.2
4.1.0
4.1.1
4.2.0
4.3.2
4.3.3
4.4.0b0
4.4.0
4.4.1
4.5.0
4.6.0
4.6.1
4.6.2
4.6.3
4.7.0
4.7.1
4.7.2
4.7.3
4.8.0b0
4.8.0
4.9
4.9.1
4.9.2
4.10.0
4.10.1
4.11
4.11.1
4.11.2
4.11.3
4.12.0
4.12.1
4.13.0.dev0
4.13.0
4.13.1
4.13.2
4.14.0
4.14.1
4.15.0
4.15.1
4.15.2
4.15.3
4.15.4
4.15.5
4.16.0.dev0
4.16.0
4.17.0
4.18.0
4.18.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-v4x9-3549-crwv/GHSA-v4x9-3549-crwv.json"