CVE-2026-4358Network attack vector

Authenticated memory corruption via SBE hash-table spill

Published Mar 17, 2026 · Updated Mar 17, 2026

Double-free in MongoDB Server 7.0 before 7.0.31, 8.0 before 8.0.20, and 8.2 before 8.2.6 allows remote authenticated users to corrupt memory. During spill-to-disk processing, the SBE engine mishandles memory used by an in-memory $lookup hash table, producing double-free or use-after-free state. Reachability requires write privileges and a crafted aggregation that forces the hash table to spill; the principal operational consequence is interruption of the database process.

CVSS severity6.1
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in MongoDB Server 7.0 before 7.0.31, 8.0 before 8.0.20, and 8.2 before 8.2.6 allows remote authenticated users to corrupt memory. During spill-to-disk processing, the SBE engine mishandles memory used by an in-memory $lookup hash table, producing double-free or use-after-free state. Reachability requires write privileges and a crafted aggregation that forces the hash table to spill; the principal operational consequence is interruption of the database process.

The record

CVE
CVE-2026-4358
Published
Mar 17, 2026
Updated
Mar 17, 2026
Vendor
MongoDB
Product
MongoDB Server
Classifications
CWE-415, T1499.004
Attack vector
network
Privileges
authenticated

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=7.0 <7.0.31
  2. Affected versionversion=8.0 <8.0.20
  3. Affected versionversion=8.2 <8.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB Serverversion=7.0 <7.0.31; version=8.0 <8.0.20; version=8.2 <8.2.6

Published CVSS scores

6.4MongoDB, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.1MongoDB, Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
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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