What’s Vulnerable › Vulnerabilities

CVE-2026-67199: Perspective 5.0.0 DoS via Loop Expression Evaluation

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-04 · updated 2026-10-23
• Weakness: CWE-770

Description

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.

Affected products

• perspective-dev perspective: through 5.0.0

References

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

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