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Vulnerability record · CVE-2026-26210 · published 23 April 2026

CVE-2026-26210: Kvcache-ai ktransformers deserialization of untrusted data vulnerability

KKvcache Ai · Ktransformers

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.

9.3 CVSS 4.0 Critical EPSS 1.0% · top 37.3% CWE-502 · Deserialization of untrusted data
9.3CVSS 4.0 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
14 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://chocapikk.com/posts/2026/ktransformers-pickle-rce/ ExploitMitigationThird Party Advisory
https://github.com/kvcache-ai/ktransformers/pull/1944 Issue TrackingPatch
https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-26210), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.