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TI-2026-84470 Aliases CVE-2026-120678

Memory leak in MongoDB C Driver when compressed replies fail to parse

Priority LOW 38CWE-401Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-401.

Summary

MongoDB C Driver versions from 1.25.0 through 1.30.14 and from 2.0.0 through 2.5.7 are affected. A memory management flaw in handling compressed responses (CWE-401) makes the client library hold memory that is never released. An unauthenticated party that controls the database endpoint an application connects to can cause repeated, unbounded memory growth, which may make the application unavailable. No credentials or user interaction are required.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.

Why it matters now

EPSS 0.00389 33rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MongoDBC Driver1.25.0 – 1.30.14; 2.0.0 – 2.5.7—No fix listedCNA
  • C Driver VendorMongoDB Affected 1.25.0 – 1.30.14; 2.0.0 – 2.5.7 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:*:*:*——MongoDB
  • cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:*:*:* Versions — — ·MongoDB

Remediation

The sources list no fixed version for MongoDB C Driver.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-120678
  2. 2026-11-03 Title updated · CNA
  3. 2026-11-04 Affected versions changed · Red Hat
  4. 2026-11-04 CVSS score added · Red Hat
  5. 2026-11-05 Priority changed: MEDIUM → LOW

References

Other 1

  • TI-2019-08023 Code injection in mongo-express KEVCVSS 3.1CRITICAL 9.9
  • TI-2025-13542 Zlib compressed protocol header length confusion may allow memory read KEVCVSS 4.0HIGH 8.7
  • TI-2026-79432 BSON output corruption via out-of-range binary subtype in MongoDB C# Driver CVSS 4.0MEDIUM 6.9
  • TI-2026-79424 NoSQL command injection via mismatched BSON length in MongoDB C# Driver CVSS 4.0MEDIUM 6.9
  • TI-2026-79422 Unbounded memory growth in MongoDB C# Driver BSON deserialization CVSS 4.0HIGH 8.2
  • TI-2026-79427 Authentication bypass via issuer-and-serial-only certificate equality CVSS 4.0HIGH 7.6
See all 376 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences