# CVE-2026-114644: Memory-exhaustion denial of service via unbounded symbol interning during BSON/JSON deserialization

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

The MongoDB C# Driver's BSON library contains an uncontrolled resource consumption weakness in its deserialization handling of one BSON value type. An application that deserializes untrusted content with the library retains data derived from that content for the lifetime of the process, with no limit on how much accumulates. An unauthenticated remote party who can cause such content to be deserialized can drive unbounded memory growth, exhausting the host application's available memory and denying service. There is no impact to confidentiality or integrity, and no MongoDB server component is affected.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- MongoDB / C# Driver: ≥ 2.0.0; < 3.13.0 (affected, semver). Source: CNA: mongodb

## Severity and prioritization

- CVSS 4.0: 8.2 (high); CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: mongodb

- CVSS 3.1: 5.9 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: mongodb

- CISA KEV: No listing in collected sources

- EPSS: 0.48% as of 2026-11-02; percentile 41.47%

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

- Weaknesses: CWE-770

## Exploit evidence

- exploit: https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-x24v-h3xm-qf9x (ADP: CISA-ADP)

## References

- https://jira.mongodb.org/browse/CSHARP-6162 (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-x24v-h3xm-qf9x (CNA: mongodb)

- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-x24v-h3xm-qf9x (ADP: CISA-ADP; exploit)

## Provenance

- CNA: mongodb: https://www.cve.org/CVERecord?id=CVE-2026-114644; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-114644; retrieved 2026-11-02; source updated Not reported

Revision: d82b9dc0e2e1d5f8fd6431ec62fb567061a27fe1ffb5df7acb549247502f287d

Canonical: https://y2.dev/cve/CVE-2026-114644

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