CVE-2026-67199Public exploitNetwork attack vector

Service hang via unbounded loop expressions

Published Aug 4, 2026 · Updated Aug 4, 2026

Denial of service in Perspective 5.0.0 allows remote authenticated users to hang the server through a crafted expression. The C++ expression engine accepts for and while constructs in TableMakeViewReq without an iteration cap, deadline, or cancellation check. A client able to create a view can monopolize the Tornado IOLoop, leaving the process running but unresponsive to every connected client.

CVSS severity7.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Perspective 5.0.0 allows remote authenticated users to hang the server through a crafted expression. The C++ expression engine accepts for and while constructs in TableMakeViewReq without an iteration cap, deadline, or cancellation check. A client able to create a view can monopolize the Tornado IOLoop, leaving the process running but unresponsive to every connected client.

The record

CVE
CVE-2026-67199
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Perspective
Product
Perspective
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 <=5.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Perspective · Perspectiveversion=0 <=5.0.0

Published CVSS scores

6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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.

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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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

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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