---
id: CVE-2026-26210
title: KTransformers Unsafe Deserialization RCE via balance_serve
summary: >-
  KTransformers through 0.5.3 contains an unsafe deserialization vulnerability
  in the balance_serve backend mode where the scheduler RPC server binds a ZMQ
  ROUTER socket to all interfaces with no authentication and deserializes
  incoming me…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-502
vendor: kvcache-ai
product: ktransformers
affected:
  - ktransformers <= 0.5.3
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-04-24T14:02:53.606000Z'
exploitAvailable: true
published: '2026-04-23'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:01:30.381Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-26210'
references:
  - url: 'https://chocapikk.com/posts/2026/ktransformers-pickle-rce/'
  - url: 'https://github.com/kvcache-ai/ktransformers/pull/1944'
  - url: >-
      https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve
tags:
  - cve.org
  - exploit-available
epss: 0.00703
epssPercentile: 0.53556
ingestedAt: '2026-11-08T14:51:22.470Z'
---

## Overview

KTransformers through 0.5.3 contains an unsafe deserialization vulnerability in the balance_serve backend mode where the scheduler RPC server binds a ZMQ ROUTER socket to all interfaces with no authentication and deserializes incoming messages using pickle.loads() without validation. Attackers can send a crafted pickle payload to the exposed ZMQ socket to execute arbitrary code on the server with the privileges of the ktransformers process.

## Affected

- `ktransformers <= 0.5.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.