CVE-2026-26210 KTransformers Unsafe Deserialization RCE via balance_serve
Attackers can execute arbitrary code on KTransformers servers by sending crafted pickle payloads to the exposed ZMQ socket in balance_serve mode.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26210?
CVE-2026-26210 is a critical unsafe deserialization vulnerability in kvcache-ai ktransformers, published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-26210?
It affects 1 product.
Products include Kvcache-Ai Ktransformers.
How do I fix CVE-2026-26210?
No fix has been published for CVE-2026-26210 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-26210 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26210 exists.
Sources
Also known as GHSA-w598-p4vc-7qcx.