CVE-2026-4359Network attack vector

Application crash via unterminated HTTP response parsing

Published Mar 17, 2026 · Updated Mar 17, 2026

Heap-buffer over-read in MongoDB C Driver before 2.2.3 allows man-in-the-middle attackers to crash linked applications. _mongoc_http_send passes an HTTP response buffer that is not guaranteed to be NUL-terminated to strstr, which reads beyond the allocation. Exploitation requires control of a third-party cloud server response or an interception position, and the bounded impact is process termination.

CVSS severity2.0
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer over-read in MongoDB C Driver before 2.2.3 allows man-in-the-middle attackers to crash linked applications. _mongoc_http_send passes an HTTP response buffer that is not guaranteed to be NUL-terminated to strstr, which reads beyond the allocation. Exploitation requires control of a third-party cloud server response or an interception position, and the bounded impact is process termination.

The record

CVE
CVE-2026-4359
Published
Mar 17, 2026
Updated
Mar 17, 2026
Vendor
MongoDB
Product
MongoDB C++ Driver
Classifications
CWE-158, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MongoDB · MongoDB C++ Driverversion=0 <2.2.3

Published CVSS scores

2.3MongoDB, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
3.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
2.0MongoDB, Inc.CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-158Improper Neutralization of Null Byte or NUL Character
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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