CVE-2026-26210
KTransformers Unsafe Deserialization RCE via balance_serve
CRITICAL 9.3EPSS 1.0%
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.
- Affected
- kvcache-ai · ktransformers
- CVSS v4.0 VULNCHECK
- 9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULNCHECK
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 1.04% chance of exploitation in the next 30 days, 64th percentile
- Published
- 2026-04-23
- Updated
- 2026-07-14
Proof-of-concept exploits (1)
Security advisories
- https://chocapikk.com/posts/2026/ktransformers-pickle-rce
- https://www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance…
- kvcache-ai/ktransformers/pull/1944