CVSS 4.0
8.3 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:NCVE-2026-96748
High (8.3). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in pymongo 4.18.2.
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.
Severity
CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
- CWE
- CWE-177
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-vp6j-j7w5-5xjj | PyPI | pymongo | >=3.5.0 <4.18.2 | 4.18.2 |
| PYSEC-2026-4297 | PyPI | pymongo | >=3.5.0 <4.18.2 | 4.18.2 |