CVE-2026-26210

CRITICAL 9.8

KTransformers Unsafe Deserialization RCE via balance_serve

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-502
Vendor	kvcache-ai
Product	ktransformers
Published	Apr 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

kvcache-ai / ktransformers

0 ≤ 0.5.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

chocapikk.com: https://chocapikk.com/posts/2026/ktransformers-pickle-rce/ github.com: https://github.com/kvcache-ai/ktransformers/pull/1944 vulncheck.com: https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve

Credits

Valentin Lobstein (Chocapikk)