CVE-2026-120678
High
Description
A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.
SeverityHigh
CVSS7.5
Exploit probability—
Product
C Driver
PublishedNov 3, 2026
First seenNov 4, 2026
Weakness typeCWE-401CWE-401
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| MongoDB C Driver | 1.25.0 ≤ v ≤ 1.30.14, 2.0.0 ≤ v ≤ 2.5.7 | — |
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