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CVE-2025-14847

Zlib compressed protocol header length confusion may allow memory read

  • High 8.7
  • Exploited: added to CISA KEV 29 Dec 2025

Description

Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unauthenticated client. This issue affects all MongoDB Server v7.0 prior to 7.0.28 versions, MongoDB Server v8.0 versions prior to 8.0.17, MongoDB Server v8.2 versions prior to 8.2.3, MongoDB Server v6.0 versions prior to 6.0.27, MongoDB Server v5.0 versions prior to 5.0.32, MongoDB Server v4.4 versions prior to 4.4.30, MongoDB Server v4.2 versions greater than or equal to 4.2.0, MongoDB Server v4.0 versions greater than or equal to 4.0.0, and MongoDB Server v3.6 versions greater than or equal to 3.6.0.

Key facts

Published
19 Dec 2025
Last changed
26 Feb 2026
Assigned by
mongodb
KEV added
29 Dec 2025
KEV fix due
19 Jan 2026
EPSS
83.218% likely to be exploited in the next 30 days, higher than 99.684% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.7CVSS 4.0, Highfrom the CNA (mongodb)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • 7.5CVSS 3.1, Highfrom the CNA (mongodb)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What to do

  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
MongoDB Inc.MongoDB Server
  • Default status: unaffected
  • 8.2 up to but excluding 8.2.3 (affected)
  • 8.0 up to but excluding 8.0.17 (affected)
  • 7.0 up to but excluding 7.0.28 (affected)
  • 6.0 up to but excluding 6.0.27 (affected)
  • 5.0 up to but excluding 5.0.32 (affected)
  • 4.4 up to but excluding 4.4.30 (affected)
  • 4.2 (affected)
  • 4.0 (affected)
  • 3.6 (affected)

Timeline

  1. 19 Dec 2025 Published
  2. 29 Dec 2025 Added to the CISA KEV catalogue

Weakness

References