CVE-2026-26210

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

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

CVSS 3.1

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

EPSS

0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-26)

CWE

CWE-502

Published

2026-04-23

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• kvcache-ai:ktransformers

References

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

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