Critical severity · published Jul 20, 2026
CVE-2026-63767
ktransformers Unauthenticated Pickle Deserialization RCE via ZMQ
9.8
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KT
ktransformers · kvcache-ai
through 0.6.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63767
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63767
github.com
https://github.com/kvcache-ai/ktransformers/commit/def0f9313d6e063b5c5ccdfa1f6707f7a40dfdca
github.com
https://github.com/kvcache-ai/ktransformers/issues/2087
github.com
https://github.com/kvcache-ai/ktransformers/pull/2091
www.vulncheck.com
https://www.vulncheck.com/advisories/ktransformers-unauthenticated-pickle-deserialization-rce-via-zmq
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