MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability (CVE-2025-14847)
Severity: high · Patch status: patched · Since 2025-12-29 · CVE-2025-14847
MongoDB Server contains an improper handling of length parameter inconsistency vulnerability in Zlib compressed protocol headers. This vulnerability may allow a read of uninitialized heap memory by an unauthenticated client. CISA added CVE-2025-14847 to its Known Exploited Vulnerabilities catalog on Dec 29, 2025, which means attackers are exploiting it in the wild.
What to do
- 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 agencies must remediate by Jan 19, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch