PT-2026-34754 · Kvcache Ai · Transformers

Valentin Lobstein · Published 2026-04-23 · Updated 2026-05-11 · CVE-2026-26210

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions KTransformers versions prior to 0.5.4

Description In the balance serve backend mode, the scheduler RPC server binds a ZMQ ROUTER socket to all interfaces without authentication. The server uses the pickle.loads() function to deserialize incoming messages without proper validation. This allows an attacker to send a specially crafted pickle payload to the exposed ZMQ socket, leading to arbitrary code execution on the server with the privileges of the ktransformers process.

Recommendations Update to a version newer than 0.5.3. As a temporary mitigation, restrict access to the ZMQ socket or avoid using the balance serve backend mode until the update is applied.

Exploit

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-26210

Affected Products

Transformers

References · 9

• 🔥 https://chocapikk.com/posts/2026/ktransformers-pickle-rce · Exploit
• https://github.com/kvcache-ai/ktransformers/pull/1944 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-26210 · Security Note
• https://vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve · Note
• https://twitter.com/lyrie_ai/status/2053695501279568190 · Twitter Post
• https://twitter.com/lyrie_ai/status/2053695502030372904 · Twitter Post
• https://twitter.com/lyrie_ai/status/2053695502856655019 · Twitter Post
• https://t.me/cveNotify/162198 · Telegram Post
• https://twitter.com/Chocapikk_/status/2047435411576750308 · Twitter Post