# CVE-2026-114648: NoSQL injection via dot and dollar characters in LINQ filter field names and dictionary keys

Status: published. Published: 2026-10-22. Updated: 2026-11-02.

The MongoDB C# Driver does not neutralize dot and dollar characters in dictionary keys, field names and array-filter identifiers used in LINQ queries before placing them into the field paths it sends to the server. An application user whose input reaches these positions can redirect a query or update to fields the application did not name, which can expose other users' documents and widen updates beyond the intended data. Certain values can also write malformed fields that leave stored documents unreadable by the application until they are repaired.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- MongoDB / C# Driver: ≥ 2.14.0; < 3.13.0 (affected, semver). Source: CNA: mongodb

## Severity and prioritization

- CVSS 4.0: 7.2 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N; source: CNA: mongodb

- CVSS 3.1: 7.6 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H; source: CNA: mongodb

- CISA KEV: No listing in collected sources

- EPSS: 0.32% as of 2026-11-01; percentile 25.14%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-943

## Exploit evidence

- exploit: https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-2xqr-fxmx-2cmf (ADP: CISA-ADP)

## References

- https://jira.mongodb.org/browse/CSHARP-6181 (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0 (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-2xqr-fxmx-2cmf (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-2xqr-fxmx-2cmf (ADP: CISA-ADP; exploit)

## Provenance

- CNA: mongodb: https://www.cve.org/CVERecord?id=CVE-2026-114648; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-114648; retrieved 2026-11-02; source updated Not reported

Revision: 5b1855170147665efd04d133bf00785ece0d2dabb51eb49638fe91b3ab5329b8

Canonical: https://y2.dev/cve/CVE-2026-114648