CVE-2026-63767: Insecure Deserialization (CVSS 9.8)

Description

ktransformers through 0.6.3, fixed in commit def0f93, contains an unauthenticated pickle deserialization vulnerability that allows remote attackers to execute arbitrary commands by sending crafted pickle payloads to the SchedulerServer ZMQ ROUTER socket bound to all interfaces. Attackers can exploit malicious __reduce__ methods embedded in crafted pickle payloads to execute arbitrary shell commands as the server process.

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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

0.0074

Probability of exploitation

0.51%

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

References

Other References

https://github.com/kvcache-ai/ktransformers/commit/def0f9313d6e063b5c5ccdfa1f6707f7a40dfdca https://github.com/kvcache-ai/ktransformers/issues/2087 https://github.com/kvcache-ai/ktransformers/pull/2091 https://www.vulncheck.com/advisories/ktransformers-unauthenticated-pickle-deserialization-rce-via-zmq

Frequently Asked Questions

What is CVE-2026-63767? +

ktransformers through 0.6.3, fixed in commit def0f93, contains an unauthenticated pickle deserialization vulnerability that allows remote attackers to execute arbitrary commands by sending crafted pickle payloads to the SchedulerServer ZMQ ROUTER socket bound to all interfaces. Attackers can exploit malicious __reduce__ methods embedded in crafted pickle payloads to execute arbitrary shell commands as the server process. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-63767? +

CVE-2026-63767 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 0.0074, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-63767? +

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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