CVE-2026-81520Network attack vectorHinoki check available

Connection exhaustion via unbounded SASL negotiation

Published Aug 28, 2026 · Updated Aug 28, 2026

Denial of service in MongoDB Connector for BI before 2.14.31 allows remote attackers to exhaust connection capacity through SASL login. The SASL authorization loop has neither an overall negotiation bound nor a client-read deadline, so an incomplete exchange retains its worker, client slot, and backend connections. No credentials or user interaction are required; repeated unfinished sessions block legitimate connections until the process restarts.

CVSS severity8.7
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in MongoDB Connector for BI before 2.14.31 allows remote attackers to exhaust connection capacity through SASL login. The SASL authorization loop has neither an overall negotiation bound nor a client-read deadline, so an incomplete exchange retains its worker, client slot, and backend connections. No credentials or user interaction are required; repeated unfinished sessions block legitimate connections until the process restarts.

The record

CVE
CVE-2026-81520
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
MongoDB
Product
MongoDB Connector for BI
Classifications
CWE-1088, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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 <2.14.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MongoDB · MongoDB Connector for BIversion=0 <2.14.31

Published CVSS scores

8.7MongoDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5MongoDB CNACVSS:3.1/AV:N/AC:L/PR:N/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.

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-1088Synchronous Access of Remote Resource without Timeout
T1499.002Service Exhaustion Flood

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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