MongoBleed Explained Simply
4 months ago
- #Vulnerability
- #MongoDB
- #Security
- MongoBleed (CVE-2025-14847) is a critical vulnerability in MongoDB allowing attackers to read arbitrary heap memory data.
- Affects all MongoDB versions since 2017, introduced via a zlib1 message compression path bug.
- Exploit requires no authentication; attackers can read sensitive data like passwords, API keys, and PII.
- Vulnerability stems from incorrect handling of the 'uncompressedSize' field in compressed messages.
- Attackers can force the server to leak memory contents by sending malformed BSON objects without null terminators.
- MongoDB's delayed patch release and lack of public communication raised concerns.
- Mitigation includes updating to the latest version or disabling zlib network compression.
- Over 213,000 MongoDB instances are exposed to the internet, making them potential targets.