CVE-2025-14847
MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 19 January 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 83.22% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 29 December 2025 · due 19 January 2026
- Weakness
- CWE-130
- Affected
- mongodb/mongodb
- Source
- cna@mongodb.com
EPSS 83.2% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. 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
References
- https://jira.mongodb.org/browse/SERVER-115508Issue Tracking, Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/12/29/21Mailing List
- https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847Technical Description, Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-serverExploit, Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-serverExploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.