# CVE-2026-26189 — aquasecurity trivy-action

> As of 2026-02-19, CVE-2026-26189 is a MEDIUM-severity vulnerability in aquasecurity trivy-action, CVSS v3.1 5.9, EPSS 2.1% (81.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-26189, most recently “TeamPCP LiteLLM Supply Chain Attack — Trojaned PyPI Packages (v1.82.7/1.82.8) with Multi-Stage C2 Payload”.

**Last updated:** 2026-02-19

## What is CVE-2026-26189?

Trivy Action runs Trivy as GitHub action to scan a Docker container image for vulnerabilities. A command injection vulnerability exists in `aquasecurity/trivy-action` versions 0.31.0 through 0.33.1 due to improper handling of action inputs when exporting environment variables. The action writes `export VAR=` lines to `trivy_envs.txt` based on user-supplied inputs and subsequently sources this file in `entrypoint.sh`. Because input values are written without appropriate shell escaping, attacker-controlled input containing shell metacharacters (e.g., `$(...)`, backticks, or other command substitution syntax) may be evaluated during the sourcing process. This can result in arbitrary command execution within the GitHub Actions runner context. Version 0.34.0 contains a patch for this issue. The vulnerability is exploitable when a consuming workflow passes attacker-controlled data into any action input that is written to `trivy_envs.txt`. Access to user input is required by the malicious actor. Workflows that do not pass attacker-controlled data into `trivy-action` inputs, workflows that upgrade to a patched version that properly escapes shell values or eliminates the `source ./trivy_envs.txt` pattern, and workflows where user input is not accessible are not affected.

The record classifies CVE-2026-26189 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 233 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.9 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N`)
- **EPSS (FIRST):** 2.1% probability of exploitation in the next 30 days, higher than 81.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-02-19

## Is CVE-2026-26189 being exploited?

It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **aquasecurity**: trivy-action

Affected software packages:

- `actions:aquasecurity/trivy-action` — patched in 0.34.0

## How to fix CVE-2026-26189

Fixed versions are recorded for 1 package: actions:aquasecurity/trivy-action 0.34.0. No vendor patch reference has been recorded for CVE-2026-26189 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-26189

1 tracked threat in the Threadlinqs corpus references CVE-2026-26189, either in the campaign’s CVE list or as an indicator on the campaign record.

- [TeamPCP LiteLLM Supply Chain Attack — Trojaned PyPI Packages (v1.82.7/1.82.8) with Multi-Stage C2 Payload](https://intel.threadlinqs.com/threat/TL-2026-0304) — CRITICAL · 2026-03-31

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [github.com](https://github.com/aquasecurity/trivy-action/security/advisories/GHSA-9p44-j4g5-cfx5)

**Other references**

- [github.com](https://github.com/aquasecurity/trivy-action/commit/7aca5acc9500b463826cc47a47a65ad7d404b045)
- [github.com (bc61dc55704e2d5704760f3cdab0d09acf16e4ca)](https://github.com/aquasecurity/trivy-action/commit/bc61dc55704e2d5704760f3cdab0d09acf16e4ca)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-26189
Full detection coverage and IOCs for threats exploiting CVE-2026-26189 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp