CVE-2026-33075

HighPublic PoC

Published: 20 March 2026

Published

20 March 2026

Modified

23 March 2026

KEV Added

—

Patch

—

CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0002 4.1th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-33075 is a high-severity Download of Code Without Integrity Check (CWE-494) vulnerability in Fastgpt Fastgpt. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Compromise Software Supply Chain (T1195.002); ranked at the 4.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

This vulnerability is AI-related — categorised as APIs and Models; in the Privacy and Disclosure risk domain.

The strongest mitigations our analysis identified are NIST 800-53 SA-12 (Supply Chain Protection) and SR-3 (Supply Chain Controls and Processes).

Threat & Defense at a Glance

What attackers do: exploitation maps to Compromise Software Supply Chain (T1195.002) and 2 other techniques. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SR-3 Supply Chain Controls and Processes good match

prevent

Implements supply chain controls and processes to protect CI/CD workflows from arbitrary code execution, secret exfiltration, and malicious Docker image pushes triggered by untrusted pull requests.

SA-12 Supply Chain Protection good match

prevent

Protects against supply chain risks by preventing unauthorized modifications and compromises during development and distribution of components like Docker images built from attacker-controlled Dockerfiles.

CM-5 Access Restrictions for Change partial match

prevent

Restricts access to changes in GitHub Actions workflow configurations, mitigating the risk of deploying vulnerable pull_request_target workflows that checkout and execute untrusted fork code.

MITRE ATT&CK Enterprise TechniquesAI

T1195.002 Compromise Software Supply Chain Initial Access

Adversaries may manipulate application software prior to receipt by a final consumer for the purpose of data or system compromise.

attack.mitre.org →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

T1041 Exfiltration Over C2 Channel Exfiltration

Adversaries may steal data by exfiltrating it over an existing command and control channel.

attack.mitre.org →

Why these techniques?

Vulnerability directly enables arbitrary code execution in privileged CI workflow via attacker-controlled Dockerfile (T1059.004 Unix Shell), secret exfiltration from injected env vars (T1041), and supply chain compromise via malicious image push to registry (T1195.002).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

FastGPT is an AI Agent building platform. In versions 4.14.8.3 and below, the fastgpt-preview-image.yml workflow is vulnerable to arbitrary code execution and secret exfiltration by any external contributor. It uses pull_request_target (which runs with access to repository secrets) but checks…

out code from the pull request author's fork, then builds and pushes Docker images using attacker-controlled Dockerfiles. This also enables a supply chain attack via the production container registry. A patch was not available at the time of publication.

Deeper analysisAI

CVE-2026-33075 affects FastGPT, an AI Agent building platform, specifically in versions 4.14.8.3 and below. The vulnerability resides in the fastgpt-preview-image.yml GitHub Actions workflow, which enables arbitrary code execution and secret exfiltration. This occurs because the workflow uses the pull_request_target event trigger, granting it access to repository secrets, while checking out code from the pull request author's fork and subsequently building and pushing Docker images based on attacker-controlled Dockerfiles.

Any external contributor can exploit this vulnerability by submitting a malicious pull request. The attacker-controlled code from their fork executes in an environment with repository secret privileges, allowing arbitrary code execution, exfiltration of secrets, and a supply chain attack by pushing malicious Docker images to the production container registry.

The GitHub security advisory at https://github.com/labring/FastGPT/security/advisories/GHSA-xfx8-w35j-485c notes that no patch was available at the time of publication on 2026-03-20.

FastGPT's role as an AI Agent platform introduces relevance to AI/ML workflows, where supply chain compromises could propagate risks to downstream AI deployments. No real-world exploitation has been reported in the provided details.