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CVE-2026-84962— Authenticated KMS request forgery via CRLF injection in GCP key identifier strings

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是美国MongoDB公司开源的一个加密操作库。 MongoDB libmongocrypt 1.20.2之前版本存在输入验证错误漏洞，该漏洞源于对密钥库写入权限的访问控制不当，可能导致未经授权的用户使授权客户端以授权用户身份发出任意经过身份验证的Google Cloud KMS API调用，将数据库级访问升级为云密钥控制，并破坏客户端加密。

CVSS 4.2 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB libmongocrypt < 1.20.2 affected
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I. Basic Information for CVE-2026-84962

Vulnerability Information
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Vulnerability Title
Authenticated KMS request forgery via CRLF injection in GCP key identifier strings
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB libmongocrypt 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB libmongocrypt是美国MongoDB公司开源的一个加密操作库。 MongoDB libmongocrypt 1.20.2之前版本存在输入验证错误漏洞，该漏洞源于对密钥库写入权限的访问控制不当，可能导致未经授权的用户使授权客户端以授权用户身份发出任意经过身份验证的Google Cloud KMS API调用，将数据库级访问升级为云密钥控制，并破坏客户端加密。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB libmongocrypt 0 ~ 1.20.2 -

II. Public POCs for CVE-2026-84962

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III. Intelligence Information for CVE-2026-84962

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Vendor Pages for CVE-2026-84962 (1)

Same Patch Batch · MongoDB · 2026-09-03 · 10 CVEs total

CVE-2026-84971 6.5 MEDIUM Persistent client crash loop via undersized FLE2 insert-update ciphertext in decryption pa
CVE-2026-84970 6.2 MEDIUM Heap over-read or silent misparse via 32-bit truncation of JSON length in BSON JSON parser
CVE-2026-84964 5.9 MEDIUM Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS cli
CVE-2026-84963 5.3 MEDIUM Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON
CVE-2026-84968 5.3 MEDIUM Heap out-of-bounds read via corrupt nested BSON in field path error message
CVE-2026-84965 5.1 MEDIUM Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds
CVE-2026-84966 5.1 MEDIUM BSON element injection via NUL-embedded document keys in builder append
CVE-2026-84967 4.3 MEDIUM Arbitrary command execution via shell-expanded connection string in Launch MongoDB Shell t
CVE-2026-84969 3.7 LOW Heap overflow via truncated base64 encoding of binary fields in length-limited JSON output

IV. Related Vulnerabilities

Same product: libmongocrypt
Same vendor: MongoDB
Same weakness: CWE-93

V. Comments for CVE-2026-84962

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