CVE-2025-14847 — MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

• Documented patch — jira.mongodb.org (NIST National Vulnerability Database)

CISA required action 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.

US federal deadline: Jan 19, 2026 — passed 269 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Mongodb Mongodb, Mongodb MongoDB Server).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
4. Apply the fixed version or the patch documented under Remediation.
5. EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
6. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-130

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 83.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Hunt retroactively in logs from before Dec 29, 2025 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · mongodb inc./mongodb server
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• Affected products added · mongodb/mongodb
  Oct 13, 2026 · NIST National Vulnerability Database
• CVSS changed · 7.5
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Added to CISA KEV (detected)
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Record created in this database
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• 2025
• Added to CISA KEV catalog
  Dec 28, 2025 · CISA
• CVE published
  Dec 19, 2025 · mongodb

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

• jira.mongodb.org/browse/SERVER-115508
  Issue Tracking, Patch, Vendor Advisory, NIST National Vulnerability Database
• www.openwall.com/lists/oss-security/2025/12/29/21
  Mailing List, NIST National Vulnerability Database
• www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-i
  Exploit, Third Party Advisory, NIST National Vulnerability Database
• www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongo
  Technical Description, Third Party Advisory, NIST National Vulnerability Database
• www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-
  Exploit, Third Party Advisory, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2025-14847
  GitHub Security Advisories
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  Third Party Advisory, US Government Resource, NIST National Vulnerability Database
• github.com/advisories/GHSA-4742-mr57-2r9j
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-96299 Missing Authorization Check on Internal Aggregation Stage in MongoDB Server mongos Leads to Denial of Service 2d
• Medium CVE-2026-96297 MongoDB Server may disclose process memory via a crafted `$_internalApplyOplogUpdate` aggregation pipeline 2d
• Medium CVE-2026-104005 Incorrect authorization in MongoDB Server router for bulk writes to system namespaces 2d
• Medium CVE-2026-103965 Fixed values in MongoDB Server $bucket stage may be misread as field references 2d
• Medium CVE-2026-104004 Collection validators using collation-accepting expressions can crash MongoDB Server on insert 2d
• High CVE-2026-89099 Race Condition in Mongodb Sep 11, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-14847 is "MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability", rated High. It affects Mongodb (Mongodb); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.5 describes technical severity. EPSS 83.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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