# CVE-2026-96748: pymongo: PyMongo's connection string parsing decodes percent-encoded characters in the host portion before the host list is se...

CVE-2026-96748 is fixed in 2 products on 1 platform, first by SUSE-SU-2026:4398-1, released September 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-96748
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 24, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pymongo Debian 14 | 4.18.2-1 | [DEBIAN-CVE-2026-96748](https://patchblox.com/security/data/fix/linux/debian-cve-2026-96748.md) | Oct 12, 2026 |
| Linux | python-pymongo opensuse-leap 16.0 | 4.6.3-bp160.2.1 | [OPENSUSE-SU-2026:22003-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22003-1.md) | Sep 29, 2026 |
| Linux | python-pymongo sles 15.7 | 3.11.0-150300.3.6.1 | [SUSE-SU-2026:4398-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4398-1.md) | Sep 29, 2026 |

---

Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.