CVE-2026-88035

Application crash via wrapped SASL username size check

Published Sep 10, 2026 · Updated Sep 10, 2026

Integer overflow in MongoDB C Driver 2.2.0 through 2.5.2 allows local users to crash an embedding application via a crafted SASL username. The client-side authentication size check wraps for an unusually large username and then copies the value beyond a small buffer. Exploitation requires control of connection settings, an external SASL-enabled build, and a connection configured to use that backend.

CVSS severity5.7
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in MongoDB C Driver 2.2.0 through 2.5.2 allows local users to crash an embedding application via a crafted SASL username. The client-side authentication size check wraps for an unusually large username and then copies the value beyond a small buffer. Exploitation requires control of connection settings, an external SASL-enabled build, and a connection configured to use that backend.

The record

CVE
CVE-2026-88035
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
MongoDB
Product
MongoDB .NET/C# Driver
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=2.2.0 <2.5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB .NET/C# Driverversion=2.2.0 <2.5.3

Published CVSS scores

5.7MongoDBCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.7MongoDBCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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