CVE-2026-67199
mediumpriority · track · 0EPSS 0.005 · 43 %ileEUEPSS · scored 2026-10-22
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (1)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://christbowel.com/blog/perspective-5-0-0-five-cves/cnnvd
- https://github.com/perspective-dev/perspective/releasesPatchcnnvd
- https://www.vulncheck.com/advisories/perspective-dos-via-loop-expression-evaluationcnnvd
- https://christbowel.com/blog/perspective-5-0-0-five-cves/enisa_euvd
- https://www.vulncheck.com/advisories/perspective-dos-via-loop-expression-evaluationenisa_euvd
- https://christbowel.com/blog/perspective-5-0-0-five-cves/nvd
- https://www.vulncheck.com/advisories/perspective-dos-via-loop-expression-evaluationnvd
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