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CVE-2026-84968— Heap out-of-bounds read via corrupt nested BSON in field path error message

Quick assessment

Affected
MongoDB PHP 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 PHP 驱动中的 BSON 解码组件存在越界读取漏洞，允许未认证的输入方通过提供 specially formed（精心构造的）输入，将相邻进程内存中的一小部分数据复制到返回给应用程序代码的错误信息中。这可能导致有限的内存内容被意外泄露。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 2

VendorProduct Version RangeStatus
MongoDB PHP Driver 1.15.0< 1.21.8 affected
2.0.0< 2.5.1 affected
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I. Basic Information for CVE-2026-84968

Vulnerability Information
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Vulnerability Title
Heap out-of-bounds read via corrupt nested BSON in field path error message
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver may allow an unauthenticated party who supplies specially formed input to have a small amount of adjacent process memory copied into an error message that is returned to application code. This may result in unintended disclosure of limited memory contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB PHP Driver 1.15.0 ~ 1.21.8 -

II. Public POCs for CVE-2026-84968

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-84968

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Other References for CVE-2026-84968 (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-2026-84965 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

IV. Related Vulnerabilities

Same product: PHP Driver
Same vendor: MongoDB
Same weakness: CWE-125

V. Comments for CVE-2026-84968

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