---
id: "CVE-2026-83494"
page: "https://infrastack.ai/live/CVE-2026-83494"
kind: "vulnerability"
aliases: ["CVE-2026-83494"]
title: "training-operator: PyTorchJob webhook lets users bypass immutability check"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "kubeflow", "kubernetes", "pytorch", "training-operator"]
not_affected_if: ["no-training-operator", "no-untrusted-job-users"]
published_at: "2026-11-06T07:17:57+00:00"
first_seen_at: "2026-11-06T07:40:16+00:00"
updated_at: "2026-11-06T07:41:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83494", "first_seen_at": "2026-11-06T07:40:16+00:00"}]
exploit_sources: []
---

# training-operator: PyTorchJob webhook lets users bypass immutability check

Link for people: https://infrastack.ai/live/CVE-2026-83494 (this .md is for agents)

The training-operator's PyTorchJob update webhook casts an object incorrectly, so its immutability check can be bypassed. A user with permission to edit jobs can detach a queued job from its quota system or take over a running job's controller ownership, mainly causing denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-06T07:40:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-83494

## From the sources

A flaw was found in the training-operator. An incorrect object casting in the PyTorchJob ValidateUpdate webhook allows users to bypass an immutability check. This vulnerability could enable users to detach a queued job from its quota management system or hijack a running job's controller ownership. The primary impact is a Denial of Service (DoS) condition.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_