Deserialization in Kvcache-Ai Ktransformers
CVE-2026-63767
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.
Vulnerability class: Insecure Deserialization
EPSS: 0.011 (63.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Kvcache-ai Ktransformers — versions 0, def0f9313d6e063b5c5ccdfa1f6707f7a40dfdca
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking, technical-description, exploit)
- disclosure@vulncheck.com (issue-tracking, patch)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-63767?
- CVE-2026-63767 is a critical-severity vulnerability in Kvcache-Ai Ktransformers, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-20.
- How severe is CVE-2026-63767?
- Critical severity. CVSS v3 base score is 9.8 out of 10.