TL;DR
MongoDB’s security team discovered a vulnerability (CVE-2025-14847, nicknamed “Mongobleed”) on December 12, 2025 and issued patches across Atlas, Enterprise, and Community builds. Atlas instances were largely patched within days; MongoDB says this was not a breach of its systems and urges users to apply the provided fixes.
What happened
On December 12, 2025, MongoDB’s Security Engineering team identified a vulnerability affecting MongoDB Server that the industry has labeled “Mongobleed” and cataloged as CVE-2025-14847. The company spent the following days validating the issue and developing a fix, then prepared and tested rollout plans for broad deployment. From December 15–18 MongoDB patched its Atlas managed fleet, completing most of the fleet by December 17 and finishing remaining instances — including those on customer-controlled maintenance windows — on December 18. The vulnerability was published through the CVE process on December 19, and MongoDB posted update details and guidance in its community forum on December 23. MongoDB describes the event as a patched vulnerability rather than a breach or compromise of MongoDB, Atlas, or its systems, and released patched builds for Enterprise Advanced and Community Edition users alongside the Atlas remediation.
Why it matters
- A flaw in widely used database server software can create exposure for managed and self-hosted deployments, so timely patches are critical.
- Because MongoDB manages Atlas, the company was able to apply urgent fixes on behalf of many customers quickly — reducing patching burden for those users.
- Operators running self-managed MongoDB (Enterprise or Community) must install the published patches to protect their deployments.
- The incident underscores the need for continuous security investment, rapid response processes, and clear communication to maintain customer trust.
Key facts
- Vulnerability identified internally by MongoDB Security Engineering on December 12, 2025 (detected at 19:00 ET).
- Industry CVE designation: CVE-2025-14847; community nickname: “Mongobleed.”
- Validation and fix development took place from December 12–14, with rollout planning and Atlas patching beginning December 15–17.
- Majority of the Atlas fleet was patched by December 17 at 12:10 ET; remaining Atlas instances, including those with maintenance windows, were patched December 18.
- The CVE was published on December 19, 2025; a forum update with patch and update instructions was posted December 23, 2025.
- MongoDB states this was a patched vulnerability and not a breach or compromise of MongoDB, Atlas, or MongoDB systems.
- Tens of thousands of Atlas customers and hundreds of thousands of Atlas instances were patched within days, according to MongoDB.
- Patched versions were also made available for MongoDB Enterprise Advanced and Community Edition users.
What to watch next
- Monitor MongoDB’s community forum and official channels for any further technical details or follow-up advisories (confirmed in the source).
- Ensure self-hosted MongoDB installations are updated to the patched releases provided by MongoDB (confirmed in the source).
- Further independent security analyses, exploit reports, or additional related disclosures — not confirmed in the source.
Quick glossary
- CVE: Common Vulnerabilities and Exposures; a standardized identifier for publicly known cybersecurity vulnerabilities.
- MongoDB Atlas: MongoDB’s managed database service that runs and maintains MongoDB instances on behalf of customers.
- vulnerability: A flaw or weakness in software that could be exploited to cause unintended behavior or compromise security.
- patch: A software update intended to fix bugs or security issues in an application or system.
- security engineering: The practice of designing, implementing, and validating measures to protect software and systems from security threats.
Reader FAQ
Was MongoDB or Atlas breached?
MongoDB states this issue was a patched vulnerability and not a breach or compromise of MongoDB, Atlas, or its systems (confirmed in the source).
How was the vulnerability discovered?
It was found internally by MongoDB’s Security Engineering team as part of its security program (confirmed in the source).
What should users do now?
Users should update to the patched MongoDB versions provided for Atlas, Enterprise Advanced, or Community Edition (confirmed in the source).
Were there any indications of exploitation in the wild?
not confirmed in the source
At MongoDB, protecting our customers’ data is our highest priority. On December 12, 2025, the MongoDB Security Engineering team identified a security vulnerability, described in CVE-2025-14847, which impacts MongoDB Server….
Sources
- MongoDB Server Security Update, December 2025
- Important MongoDB patch available – Server Releases
- CVE-2025-14847: MongoBleed Information Disclosure …
- MongoBleed (CVE-2025-14847): Risk, Detection & How …
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