CVE-2025-14847

HIGH 7.5

⚠️ CISA KEV

Zlib compressed protocol header length confusion may allow memory read

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-130
Vendor	mongodb inc.
Product	mongodb server
Published	Dec 19, 2025
Last Updated	Feb 26, 2026

⚠️ Actively Exploited — Act Now

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

MongoDB Inc. / MongoDB Server

8.2 < 8.2.3 8.0 < 8.0.17 7.0 < 7.0.28 6.0 < 6.0.27 5.0 < 5.0.32 4.4 < 4.4.30 4.2 4.0 3.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

jira.mongodb.org: https://jira.mongodb.org/browse/SERVER-115508 cisa.gov: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 openwall.com: http://www.openwall.com/lists/oss-security/2025/12/29/21 vicarius.io: https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server vicarius.io: https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server smartkeyss.com: https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847