CVE-2026-6691— MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-6691
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)
Vulnerability Title
MongoDB C Driver 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB C Driver是MongoDB开源的一个用于在C语言程序中连接和操作MongoDB数据库的客户端驱动库。 MongoDB C Driver存在安全漏洞，该漏洞源于Cyrus SASL集成在用户名规范化期间执行不安全的字符串复制，可能导致堆缓冲区溢出。
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 Inc. | MongoDB C Driver | 2.1.0 ~ 2.1.2 | - |
II. Public POCs for CVE-2026-6691
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-6691
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same vendor: MongoDB Inc.
- CVE-2026-8063
Post-auth null pointer dereference when aggregating against - CVE-2026-6231
bson_validate may skip validation when processing certain in - CVE-2025-14847
Zlib compressed protocol header length confusion may allow m - CVE-2025-14345
Cross-Shard Failovers May Lead to Partial Transaction Commit - CVE-2025-13644
MongoDB may be susceptible to Invariant Failure due to batch
Same weakness: CWE-120
- CVE-2026-8260
D-Link DCS-935L HNAP Service hnap_service SetDeviceSettings - CVE-2026-8137
Totolink X5000R formDdns sub_458E40 buffer overflow - CVE-2026-7857
D-Link DI-8100 CGI user_group.asp sprintf buffer overflow - CVE-2026-7856
D-Link DI-8100 Web Management url_member.asp buffer overflow - CVE-2026-7855
D-Link DI-8100 HTTP Request tggl.asp tggl_asp buffer overflo
V. Comments for CVE-2026-6691
No comments yet