What’s Vulnerable › Vulnerabilities
CVE-2026-106434: Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-08 · updated 2026-10-08
- Weakness: CWE-354
Description
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
Affected products
- MongoDB libmongocrypt: from 1.5.0 before 1.20.5 — fixed in 1.20.5
How to fix
Upgrade to a fixed version: MongoDB libmongocrypt 1.20.5. Check the vendor advisory for mitigations.
References
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