vulnerability🌐InternationalCERT-SE
Vulnerability in MongoDB
Wednesday, December 31, 2025
What
The MongoBleed vulnerability (CVE-2025-14847) allows unauthenticated remote attackers to leak memory from MongoDB servers utilizing zlib compression. This critical flaw, rated 8.7 CVSS v4.0, enables access to sensitive information from both internet-exposed and internally accessible instances.
Where
Affected systems include various MongoDB Server versions from 3.6 to 8.2. Exposed instances are concentrated in China, United States, Germany, Hong Kong, Singapore, and other countries globally.
When
Disclosed around December 29, 2025, with active exploitation confirmed by December 30, 2025.
Key Factors
- •The vulnerability, CVE-2025-14847 (MongoBleed), specifically targets zlib-compressed network traffic in MongoDB, allowing for remote, unauthenticated memory leakage.
- •Proof of Concept (PoC) code is publicly available, and active exploitation has been confirmed, leading to its inclusion in CISA's Known Exploited Vulnerabilities catalog.
- •A wide range of MongoDB versions, from 3.6 up to 8.2, are impacted, with older versions (4.2, 4.0, 3.6) having no available updates, necessitating alternative mitigation strategies.
Takeaways
- →Organizations must immediately update all vulnerable MongoDB instances to patched versions or apply vendor-recommended mitigating actions, prioritizing internet-facing deployments.
- →Implement network segmentation and strict access controls to prevent public exposure of MongoDB instances and limit lateral movement access to internal databases.
