Vulnerability · Published Apr 23, 2026 · Assigned by VulnCheck

CVE-2026-26210KTransformers Unsafe Deserialization RCE via balance_serve

Critical 9.8

In plain English

A critical-severity unsafe deserialization in ktransformers from kvcache-ai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.7%top 46.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
kvcache-ai	ktransformers	0 – through 0.5.3

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://chocapikk.com/posts/2026/ktransformers-pickle-rce/ technical-description, exploit
https://github.com/kvcache-ai/ktransformers/pull/1944 issue-tracking
https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve third-party-advisory