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CVE-2026-106438— Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver

Quick assessment

Affected
MongoDB C Driver
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 C 驱动程序在处理 Decimal128 字符串解析时存在错误计算问题，该问题会接受包含前导零的某些高精度输入，而不是拒绝它们。这会导致解析出的值与输入的文本不一致。攻击者如果能够通过扩展 JSON 解析等途径，向嵌入式应用程序提供 Decimal 字符串，就可以使该应用程序存储或使用不正确的数值。

CVSS 4.0 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
MongoDB C Driver 1.4.0< 1.30.13 affected
2.0.0< 2.5.6 affected
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I. Basic Information for CVE-2026-106438

Vulnerability Information
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Vulnerability Title
Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver
Source: CVE Program / CVE List V5
Vulnerability Description
An incorrect calculation in Decimal128 string parsing in the MongoDB C Driver can accept certain over-precision inputs containing leading zeros instead of rejecting them. This produces a value different from the supplied text. An actor who can provide a decimal string to an embedding application, including through Extended JSON parsing, can cause the application to store or use an incorrect numeric value.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB C Driver 1.4.0 ~ 1.30.13 -

II. Public POCs for CVE-2026-106438

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III. Intelligence Information for CVE-2026-106438

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Other References for CVE-2026-106438 (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-2026-106434 4.3 MEDIUM Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
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: C Driver
Same vendor: MongoDB
Same weakness: CWE-682

V. Comments for CVE-2026-106438

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