CVE-2026-67198: Perspective 5.0.0 DoS via VirtualServer Protocol Dispatcher

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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-616

Description

Perspective 5.0.0 contains a denial-of-service vulnerability in the VirtualServer protocol dispatcher that allows unauthenticated remote attackers to crash the server process by sending malformed or incomplete protobuf messages. Attackers can send well-formed requests such as ViewToArrowReq with no viewport set or MakeTableReq with no data field to trigger unwrap() calls on None values at nine distinct sites, causing the process to abort with SIGABRT.

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-virtualserver-protocol-dispatcher

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