What’s Vulnerable › Vulnerabilities

CVE-2026-26210: KTransformers Unsafe Deserialization RCE via balance_serve

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-23 · updated 2026-10-26
• Weakness: CWE-502

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

• kvcache-ai ktransformers: through 0.5.3

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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