CVE-2026-84965— Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds
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 Driver是美国MongoDB公司开源的一款C语言数据库驱动。 MongoDB C Driver 1.10.0至1.30.9之前版本和2.0.0至2.5.2之前版本存在数字错误漏洞，该漏洞源于BSON库的JSON解析代码在分配大小计算时存在整数回绕，可能导致缓冲区释放后仍通过过期指针进行写入，在32位构建环境下，未经身份验证的攻击者可提供超大JSON输入，导致链接该库的应用程序意外终止，造成拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-84965
Vulnerability Information
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Vulnerability Title
Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds
Source: CVE Program / CVE List V5
Vulnerability Description
An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB C Driver 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB C Driver是美国MongoDB公司开源的一款C语言数据库驱动。 MongoDB C Driver 1.10.0至1.30.9之前版本和2.0.0至2.5.2之前版本存在数字错误漏洞，该漏洞源于BSON库的JSON解析代码在分配大小计算时存在整数回绕，可能导致缓冲区释放后仍通过过期指针进行写入，在32位构建环境下，未经身份验证的攻击者可提供超大JSON输入，导致链接该库的应用程序意外终止，造成拒绝服务。
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
II. Public POCs for CVE-2026-84965
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Vendor Pages for CVE-2026-84965 (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-2026-84966 | 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-2026-84962 | 4.2 MEDIUM | Authenticated KMS request forgery via CRLF injection in GCP key identifier strings |
| CVE-2026-84969 | 3.7 LOW | Heap overflow via truncated base64 encoding of binary fields in length-limited JSON output |
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