CVE-2026-84964— Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS client
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 1.17.0版本至1.30.9之前版本和2.0.0版本至2.5.2之前版本存在资源管理错误漏洞，该漏洞源于基于OpenSSL的TLS证书撤销检查路径存在双重释放问题，在握手期间特制证书数据可导致同一堆对象被释放两次，可能导致未经验证的受信任端点使连接的客户端应用程序意外终止。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-84964
Vulnerability Information
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Vulnerability Title
Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS client
Source: CVE Program / CVE List V5
Vulnerability Description
A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB C Driver 资源管理错误漏洞
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 1.17.0版本至1.30.9之前版本和2.0.0版本至2.5.2之前版本存在资源管理错误漏洞，该漏洞源于基于OpenSSL的TLS证书撤销检查路径存在双重释放问题，在握手期间特制证书数据可导致同一堆对象被释放两次，可能导致未经验证的受信任端点使连接的客户端应用程序意外终止。
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-2026-84964
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Other References for CVE-2026-84964 (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-2026-84963 | 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-2026-84962 | 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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V. Comments for CVE-2026-84964
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