CVE-2026-26210

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.

CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0010

Probability of exploitation

0.27%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
kvcache-ai	ktransformers	< 0.5.3

References

Advisories & Patches

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

Exploits

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

Other References

https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-26210? +

CVE-2026-26210 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0010, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-26210? +

CVE-2026-26210 affects products from kvcache-ai, specifically: ktransformers. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-26210? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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