--- title: "CVE-2025-14847: Zlib compressed protocol header length… | CubePath" description: "Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unauthenticated client. This issue…" language: en source: https://cubepath.com/security/cve/CVE-2025-14847 --- # CVE-2025-14847: Zlib compressed protocol header length… | CubePath ## 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. Official description from the CVE record, published by mongodb. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-14847) ## Key data ### CVSS 4.0 High 8.7 Score published by mongodb in the CVE record. 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 | Metric | Value | What it means | | ----------------------------------- | ------- | --------------------------------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No measurable action is needed to get around the system's built-in security controls. The attack is repeatable. | | Attack requirements | None | The attack works without any special deployment or execution conditions. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Vulnerable system: confidentiality | High | Serious or total effect on the secrecy of data. | | Vulnerable system: integrity | None | No effect on the trustworthiness of data. | | Vulnerable system: availability | None | No effect on availability. | | Subsequent systems: confidentiality | None | No effect on other systems' data secrecy. | | Subsequent systems: integrity | None | No effect on other systems' data trustworthiness. | | Subsequent systems: availability | None | No effect on other systems' availability. | ### CVSS 3.1 High 7.5 Score published by mongodb in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | None | No effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.83218 (83.2% probability) Percentile 99.7% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability Added to the catalog Dec 29, 2025 Federal due date Jan 19, 2026 ### CISA assessment as of Dec 30, 2025 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact partial ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-130](https://cwe.mitre.org/data/definitions/130.html) Improper Handling of Length Parameter Inconsistency ## Affected products Products listed in the CVE record, as the CNA published them. - MongoDB Server - affected: 8.2 up to before 8.2.3 - affected: 8.0 up to before 8.0.17 - affected: 7.0 up to before 7.0.28 - affected: 6.0 up to before 6.0.27 - affected: 5.0 up to before 5.0.32 - affected: 4.4 up to before 4.4.30 - affected: 4.2 - affected: 4.0 - affected: 3.6 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [jira.mongodb.org/browse/SERVER-115508](https://jira.mongodb.org/browse/SERVER-115508) - [openwall.com/lists/oss-security/2025/12/29/21](http://www.openwall.com/lists/oss-security/2025/12/29/21) - [vicarius.io/vsociety/posts/cve-2025-14847-detection-script-…](https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server) - [vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script…](https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server) - [smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-v…](https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op%5Fcompressed-in-mongodb-cve-2025-14847) ## Timeline 1. ID reserved Dec 17, 2025 2. Record published Dec 19, 2025 3. Added to CISA KEV Dec 29, 2025 4. Record last updated Feb 26, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:14 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)