Unauthenticated RCE via exposed pickle deserialization
Published Jul 20, 2026 · Updated Jul 20, 2026
Deserialization of untrusted data in KTransformers through 0.6.3 allows remote attackers to execute commands through its scheduler socket. SchedulerServer binds its ZMQ ROUTER socket to all interfaces and passes every unauthenticated message to pickle.loads, allowing a crafted reduce method to invoke shell commands. Network reachability to the auto-assigned scheduler port is the only gate, and successful exploitation runs code with the server process privileges.
Summary
What happened
Deserialization of untrusted data in KTransformers through 0.6.3 allows remote attackers to execute commands through its scheduler socket. SchedulerServer binds its ZMQ ROUTER socket to all interfaces and passes every unauthenticated message to pickle.loads, allowing a crafted reduce method to invoke shell commands. Network reachability to the auto-assigned scheduler port is the only gate, and successful exploitation runs code with the server process privileges.
The record
- CVE
- CVE-2026-63767
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- KVCache.AI
- Product
- KTransformers
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=0.6.3
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- SchedulerServer pickle __reduce__ proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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