Unsafe Deserialization in KTransformers Affects Backend Security
CVE-2026-26210

9.3CRITICAL

Key Information:

Vendor

Kvcache-ai

Status
Ktransformers
Vendor
CVE Published:
23 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-26210?

KTransformers version 0.5.3 and earlier contains a serious vulnerability in its balance_serve backend that allows unsafe deserialization through the scheduler RPC server. The ZMQ ROUTER socket is bound to all network interfaces without proper authentication, enabling attackers to exploit this flaw. By sending a carefully crafted pickle payload to the exposed ZMQ socket, attackers can execute arbitrary code on the server, potentially compromising the entire system with the privileges of the KTransformers process.

Affected Version(s)

ktransformers 0 <= 0.5.3

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-2026-26210 - Proof of Concept

References

https://chocapikk.com/posts/2026/ktransformers-pickle-rce/
technical-descriptionexploit
https://github.com/kvcache-ai/ktransformers/pull/1944
issue-trackingpatch
https://www.vulncheck.com/advisories/ktransformers-unsafe...
third-party-advisory

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

Valentin Lobstein (Chocapikk)
.