Vulnerability details
CVE-2025-14847
Actively exploited
MongoDB Server
Zlib compressed protocol header length confusion may allow memory read
CVSS 4.0
8.7High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (mongodb) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (mongodb) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| MongoDB, Inc. | MongoDB Server | 3.6 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 4.0 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 4.2 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 4.4 ≤ v < 4.4.30 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 5.0 ≤ v < 5.0.32 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 6.0 ≤ v < 6.0.27 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 7.0 ≤ v < 7.0.28 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 8.0 ≤ v < 8.0.17 | CVEProject cvelistV5 (CNA) |
| MongoDB, Inc. | MongoDB Server | 8.2 ≤ v < 8.2.3 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://jira.mongodb.org/browse/SERVER-115508
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 government-resource
- http://www.openwall.com/lists/oss-security/2025/12/29/21
- 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.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847
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Details
- Published
- 2025-12-19
- Last updated
- 2026-02-26
- State
- Published
- Assigner (CNA)
- mongodb
- Kolun priority
- 78 · High
CISA KEV catalog
- Date added
- 2025-12-29
- Due date
- 2026-01-19
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
83.21%
Probability of exploitation in 30 days
99.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-130Improper Handling of Length Parameter Inconsistency