CVE-2025-14847: MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 10 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 83.2%
EPSS score, percentile 99.7 of all scored records
- How severe?
- 8.7 High
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA deadline . Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from 8.2 to before 8.2.3
- from 8.0 to before 8.0.17
- from 7.0 to before 7.0.28
- from 6.0 to before 6.0.27
- from 5.0 to before 5.0.32
- from 4.4 to before 4.4.30
and 3 more in the table below
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: .
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 8.2 to before 8.2.3 |
| Affected | from 8.0 to before 8.0.17 |
| Affected | from 7.0 to before 7.0.28 |
| Affected | from 6.0 to before 6.0.27 |
| Affected | from 5.0 to before 5.0.32 |
| Affected | from 4.4 to before 4.4.30 |
| Affected | 4.2 |
| Affected | 4.0 |
| Affected | 3.6 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2025-14847 to its Known Exploited Vulnerabilities (KEV) catalog on 29 Dec 2025.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 19 Jan 2026.
- The CVE record was published on 19 Dec 2025, 10 days before it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 8.7 (High), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 83.2% (percentile 99.7), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact partial.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Zlib compressed protocol header length confusion may allow memory read
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-130: Improper Handling of Length Parameter Inconsistency
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
References
More exploited MongoDB vulnerabilities
- CVE-2019-10758: MongoDB mongo-express Remote Code Execution Vulnerability