CVE-2026-63767

CRITICAL 9.8

ktransformers Unauthenticated Pickle Deserialization RCE via ZMQ

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-502
Vendor	kvcache-ai
Product	ktransformers
Published	Jul 20, 2026

Stay Ahead of the Next One

Get instant alerts for kvcache-ai ktransformers

Be the first to know when new critical vulnerabilities affecting kvcache-ai ktransformers are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

kvcache-ai / ktransformers

0 ≤ 0.6.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/kvcache-ai/ktransformers/issues/2087 github.com: https://github.com/kvcache-ai/ktransformers/pull/2091 github.com: https://github.com/kvcache-ai/ktransformers/commit/def0f9313d6e063b5c5ccdfa1f6707f7a40dfdca vulncheck.com: https://www.vulncheck.com/advisories/ktransformers-unauthenticated-pickle-deserialization-rce-via-zmq

Credits

George Chen