CVE-2026-67199

MEDIUM 6.5

Perspective 5.0.0 DoS via Loop Expression Evaluation

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

Perspective 5.0.0 contains a denial of service vulnerability that allows remote attackers to block the server event loop indefinitely by submitting a crafted expression containing unbounded for or while loop constructs in a TableMakeViewReq message. Attackers can embed an arbitrarily large iteration count in an expression column evaluated once per table row, causing the Tornado IOLoop to block without any iteration cap, deadline, or cancellation check, rendering the server unresponsive to all connected clients.

CWE	CWE-770
Vendor	perspective-dev
Product	perspective
Published	Aug 4, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

perspective-dev / perspective

0 ≤ 5.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

christbowel.com: https://christbowel.com/blog/perspective-5-0-0-five-cves/ vulncheck.com: https://www.vulncheck.com/advisories/perspective-dos-via-loop-expression-evaluation

Credits

Christ Bowel Bouchuen