CVEs / CVE-2025-14847
CVE-2025-14847: MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
- Known exploited in the CISA KEV catalog since 29 Dec 2025
- high 8.7 CVSS 4.0 (from the CNA)
- EPSS 83.2% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| MongoDB Inc. MongoDB Server | from 8.2, before 8.2.3 | 8.2.3 |
| MongoDB Inc. MongoDB Server | from 8.0, before 8.0.17 | 8.0.17 |
| MongoDB Inc. MongoDB Server | from 7.0, before 7.0.28 | 7.0.28 |
| MongoDB Inc. MongoDB Server | from 6.0, before 6.0.27 | 6.0.27 |
| MongoDB Inc. MongoDB Server | from 5.0, before 5.0.32 | 5.0.32 |
| MongoDB Inc. MongoDB Server | from 4.4, before 4.4.30 | 4.4.30 |
| MongoDB Inc. MongoDB Server | 4.2 | — |
| MongoDB Inc. MongoDB Server | 4.0 | — |
| MongoDB Inc. MongoDB Server | 3.6 | — |
Exploitation
| In CISA KEV since | 29 Dec 2025 |
|---|---|
| Due date for US federal agencies | 19 Jan 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| 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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-130 |
References
- CVE-2025-14847 on NVD
- CVE-2025-14847 in the CISA KEV catalog
- https://jira.mongodb.org/browse/SERVER-115508 (cited by CISA)
- CVE-2025-14847 on OSV
- https://jira.mongodb.org/browse/SERVER-115508 Issue Tracking, Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/12/29/21 Mailing List
- https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847 Technical Description, Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server Exploit, Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 Third Party Advisory, US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.