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CVE-2026-106434— Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt

Quick assessment

Affected
MongoDB libmongocrypt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MongoDB libmongocrypt 的显式解密组件在遇到无法识别的加密载荷时，可能会直接将其原样返回，而不是返回解密错误。具备修改已加密字段能力的攻击者（例如数据库写入者、服务器或网络中间人）可以使得受影响的将应用把所提供的字节串当作已解密的明文进行处理。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1407

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB libmongocrypt 1.5.0< 1.20.5 affected
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I. Basic Information for CVE-2026-106434

Vulnerability Information
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Vulnerability Title
Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB libmongocrypt 1.5.0 ~ 1.20.5 -

II. Public POCs for CVE-2026-106434

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-106434

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Other References for CVE-2026-106434 (1)

Same Patch Batch · MongoDB · 2026-10-08 · 13 CVEs total

CVE-2026-106433 8.8 HIGH Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt
CVE-2026-106429 6.5 MEDIUM Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
CVE-2026-106437 6.2 MEDIUM Out-of-bounds read and write via undersized BSON buffer reservation in MongoDB C Driver
CVE-2026-106430 5.9 MEDIUM Query and rename target confusion via embedded NUL truncation in MongoDB C++ Driver
CVE-2026-107325 5.9 MEDIUM Application denial of service via missing BSON array length validation in MongoDB Go Drive
CVE-2026-107324 5.9 MEDIUM Application denial of service via integer overflow in BSON value-length validation in Mong
CVE-2026-106431 5.7 MEDIUM One-byte heap buffer overflow in BSON bulk document writer in MongoDB C Driver
CVE-2026-106435 5.1 MEDIUM Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Pyt
CVE-2026-106436 4.8 MEDIUM Application denial of service and data truncation via unchecked BSON append failures in Mo
CVE-2026-106438 4.0 MEDIUM Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver
CVE-2026-106428 3.7 LOW Out-of-bounds read in SCRAM response parsing in MongoDB C Driver
CVE-2026-106432 3.6 LOW Heap buffer overflow via 32-bit string-length truncation in MongoDB PHP Driver

IV. Related Vulnerabilities

Same product: libmongocrypt
Same vendor: MongoDB
Same weakness: CWE-354

V. Comments for CVE-2026-106434

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