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CVE-2025-14847

Zlib compressed protocol header length confusion may allow memory read

HIGH
7.5
CVSS Score
Published: December 19, 2025 at 11:00 AM UTC
Updated: June 17, 2026 at 08:36 AM UTC
1 product affected across 1 vendorMongoDB

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Severity
HIGH7.5
Exploitation
CISA KEV
Exploit prediction
EPSS 83%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score83.2%

EPSS (Exploit Prediction Scoring System) estimates a 83.2% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

MongoDB Server contains an improper handling of length parameter inconsistency vulnerability in Zlib compressed protocol headers. This vulnerability may allow a read of uninitialized heap memory by an unauthenticated client.

Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Unknown
Added to KEV
Dec 29, 2025
Remediation Due
Jan 19, 2026
280 days overdue
Notes
This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://jira.mongodb.org/browse/SERVER-115508
https://nvd.nist.gov/vuln/detail/CVE-2025-14847

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MongoDB· MongoDB
95%
3.6.0 ≤ v < 4.4.304.4 ≤ v < 4.4.305.0 ≤ v < 5.0.325.0.0 ≤ v < 5.0.326.0 ≤ v < 6.0.276.0.0 ≤ v < 6.0.277.0 ≤ v < 7.0.287.0.0 ≤ v < 7.0.288.0 ≤ v < 8.0.178.0.0 ≤ v < 8.0.178.2 ≤ v < 8.2.38.2.0 ≤ v < 8.2.33.64.04.24.45.06.07.08.08.2
Affected range stops below 4.4.30, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.32, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.27, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.28, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.2.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (6)

Issue TrackingPatchVendor Advisory
Source: cverecord
https://jira.mongodb.org/browse/SERVER-115508
Mailing List
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2025/12/29/21
Technical DescriptionThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847
ExploitThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server
ExploitThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server
Third Party AdvisoryUS Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHmongodb
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-130

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