TI-2026-21201 Aliases CVE-2026-26210 GHSA-w598-p4vc-7qcx

KTransformers Unsafe Deserialization RCE via balance_serve

HIGH 81CWE-502Published 2026-04-23 · Updated 2026-11-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00703 53rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
kvcache-ai	ktransformers	up to 0.5.3	—	No fix listed	CNA

ktransformers Vendorkvcache-ai Affected up to 0.5.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:kvcache-ai:ktransformers::::::::	up to 0.5.3	Vulnerable	kvcache-ai

cpe:2.3:a:kvcache-ai:ktransformers:*:*:*:*:*:*:*:* Versions up to 0.5.3 Vulnerable ·kvcache-ai

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-26210
2026-10-03 Alias added: GHSA-w598-p4vc-7qcx

References

Exploit 1

https://chocapikk.com/posts/2026/ktransformers-pickle-rce/

Patch 1

https://github.com/kvcache-ai/ktransformers/pull/1944

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences