{"cve":"CVE-2026-96748","nvd":{"published":"2026-09-24T19:17:20.813","modified":"2026-09-24T21:00:46.893","status":"Awaiting Analysis","description":"PyMongo's connection string parsing decodes percent-encoded characters in the host portion before the host list is separated on its delimiters. When an application places a hostname value supplied by an unauthenticated party into a connection string, that party may cause additional servers of their choosing to be added to the application's database client. The application may then send its authentication exchange and database operations to one of those servers, which can observe limited information and return altered results.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5},"cwes":["CWE-177"],"references":["https://github.com/mongodb/mongo-python-driver/blob/4.18.2/doc/changelog.rst","https://github.com/mongodb/mongo-python-driver/releases/tag/4.18.2","https://github.com/mongodb/mongo-python-driver/security/advisories/GHSA-vp6j-j7w5-5xjj"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-96748","score":0.00361,"percentile":0.29884,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vp6j-j7w5-5xjj","url":"https://osv.dev/vulnerability/GHSA-vp6j-j7w5-5xjj","summary":"PyMongo: PYTHON-5986 Host injection in PyMongo connection string parsing via percent-encoded delimiters","modified":"2026-10-15T14:56:13.301997054Z","packages":[{"ecosystem":"PyPI","name":"pymongo","purl":"pkg:pypi/pymongo","ranges":[">=3.5.0 <4.18.2"],"fixed":["4.18.2"]}]},{"id":"PYSEC-2026-4297","url":"https://osv.dev/vulnerability/PYSEC-2026-4297","summary":"PyMongo: PYTHON-5986 Host injection in PyMongo connection string parsing via percent-encoded delimiters","modified":"2026-10-15T14:45:14.721529972Z","packages":[{"ecosystem":"PyPI","name":"pymongo","purl":"pkg:pypi/pymongo","ranges":[">=3.5.0 <4.18.2"],"fixed":["4.18.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}