CVE-2026-63767 ktransformers Unauthenticated Pickle Deserialization RCE via ZMQ
Remote attackers can execute arbitrary commands via unauthenticated pickle deserialization in the ktransformers SchedulerServer ZMQ socket.
- 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-2026-63767?
CVE-2026-63767 is a critical unsafe deserialization vulnerability in kvcache-ai ktransformers, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-63767?
How do I fix CVE-2026-63767?
No fix has been published for CVE-2026-63767 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-2026-63767 being exploited?
There is no known exploitation of CVE-2026-63767 in the wild and no public exploit code.
Sources
Also known as GHSA-6vqg-j4cx-cqv4.