CVE-2026-106434

Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt

Published Oct 8, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mongodb
Mongodb libmongocrypt
Vendors & Products Mongodb
Mongodb libmongocrypt
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
Weaknesses CWE-354
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mongodb
Published
Updated
Oct 8, 2026, 7:30 PM
Reserved
Oct 6, 2026, 4:40 PM
Status
Awaiting Analysis
Published
Oct 8, 2026, 7:16 PM
Modified
Oct 8, 2026, 8:49 PM