Unauthenticated Pickle Deserialization Vulnerability in ktransformers by kvcache-ai
CVE-2026-63767

9.3CRITICAL

Key Information:

Vendor

Kvcache-ai

Status
Ktransformers
Vendor
CVE Published:
20 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-63767?

The ktransformers library, versions up to 0.6.3, is vulnerable to an unauthenticated pickle deserialization flaw. This vulnerability allows remote attackers to execute arbitrary commands by sending specially crafted pickle payloads to the SchedulerServer's ZMQ ROUTER socket. By exploiting malicious reduce methods embedded in the crafted payloads, attackers can gain the ability to execute arbitrary shell commands within the server process, posing a significant threat to the security of applications utilizing this library.

Affected Version(s)

ktransformers 0 <= 0.6.3

ktransformers def0f9313d6e063b5c5ccdfa1f6707f7a40dfdca

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-63767 - Proof of Concept

References

https://github.com/kvcache-ai/ktransformers/issues/2087
technical-descriptionexploit
https://github.com/kvcache-ai/ktransformers/pull/2091
issue-tracking
https://github.com/kvcache-ai/ktransformers/commit/def0f9...
patch

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.