Vulnerability · Published Jul 20, 2026 · Assigned by VulnCheck

CVE-2026-63767ktransformers Unauthenticated Pickle Deserialization RCE via ZMQ

Critical 9.8

In plain English

A critical-severity unsafe deserialization in ktransformers from kvcache-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.1%top 33.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

ktransformers through 0.6.3, fixed in commit def0f93, contains an unauthenticated pickle deserialization vulnerability that allows remote attackers to execute arbitrary commands by sending crafted pickle payloads to the SchedulerServer ZMQ ROUTER socket bound to all interfaces. Attackers can exploit malicious __reduce__ methods embedded in crafted pickle payloads to execute arbitrary shell commands as the server process.

Affected products (as reported)

Vendor	Product	Versions
kvcache-ai	ktransformers	0 – through 0.6.3

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Researcher Disclosure technical-description, exploit, issue-tracking
Pull Request issue-tracking, patch
Patch Commit patch
https://www.vulncheck.com/advisories/ktransformers-unauthenticated-pickle-deserialization-rce-via-zmq third-party-advisory