What’s Vulnerable › Vulnerabilities

CVE-2025-14847: MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-12-29
• EPSS: 83.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-19 · updated 2026-06-17
• Weakness: CWE-130

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 products

• MongoDB: from 3.6.0 before 4.4.30; from 5.0.0 before 5.0.32; from 6.0.0 before 6.0.27; from 7.0.0 before 7.0.28; from 8.0.0 before 8.0.17; from 8.2.0 before 8.2.3 — fixed in 4.4.30, 5.0.32, 6.0.27, 7.0.28, 8.0.17, 8.2.3

How to fix

Upgrade to a fixed version: MongoDB 4.4.30, 5.0.32, 6.0.27, 7.0.28. Check the vendor advisory for mitigations.

References

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

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