Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91925Polyaxon through 2.16.4 Server-Side Template Injection via Unsandboxed Jinja2 Engine

High 8.8

In plain English

A high-severity security flaw in polyaxon from polyaxon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.8%top 44.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Polyaxon through 2.16.4 renders operation specification fields with an unsandboxed Jinja2 environment during server-side run preparation, allowing authenticated users to execute arbitrary code. Attackers can submit runs with Jinja2 payloads in queue, namespace, conditions, presets, or dependencies fields to execute operating system commands in the scheduler process context, exposing database credentials and service tokens.

Affected products (as reported)

Vendor	Product	Versions
polyaxon	polyaxon	0 – through 2.16.4

Weakness: CWE-1336 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Issue #1540 issue-tracking
https://github.com/polyaxon/polyaxon product
engine.py - get_engine builds an unsandboxed jinja2.Environment used by render_template technical-description
sections.py - PARSING_SECTIONS includes the user-controlled queue, namespace and conditions fields technical-description
VulnCheck Advisory: Polyaxon through 2.16.4 Server-Side Template Injection via Unsandboxed Jinja2 Engine third-party-advisory