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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.

PUBLISHED Reserved 2026-02-11 | Published 2026-04-23 | Updated 2026-04-24 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-502 Deserialization of Untrusted Data

Product status

Default status
unknown

Any version
affected

Credits

Valentin Lobstein (Chocapikk) finder

References

chocapikk.com/posts/2026/ktransformers-pickle-rce/ technical-description exploit

github.com/kvcache-ai/ktransformers/pull/1944 issue-tracking patch

www.vulncheck.com/...e-deserialization-rce-via-balance-serve third-party-advisory

cve.org (CVE-2026-26210)

nvd.nist.gov (CVE-2026-26210)

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