---
title: "CVE-2026-34243: wenxian: Command Injection in GitHub Actions Workflow via `issue_comment.body`"
url: https://erroneo.us/security/cve/CVE-2026-34243/
description: "CVE-2026-34243 (njzjz/wenxian (GitHub Actions)): wenxian is a tool to generate BIBTEX files from given identifiers (DOI, PMID, arXiv ID, or paper title). In…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-31
date_modified: 2026-04-02
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-34243"
kev: false
cvss: 9.8
epss: 0.02778
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-34243: wenxian: Command Injection in GitHub Actions Workflow via `issue_comment.body`

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 2.8% , percentile 86: FIRST’s model estimates a 2.8% chance of exploitation activity in the next 30 days, higher than 86% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes njzjz/wenxian (GitHub Actions) <= 0.3.1, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

wenxian is a tool to generate BIBTEX files from given identifiers (DOI, PMID, arXiv ID, or paper title). In versions 0.3.1 and prior, a GitHub Actions workflow uses untrusted user input from issuecomment.body directly inside a shell command, allowing potential command injection and arbitrary code execution on the runner. At time of publication, there are no publicly available patches.

## Affected packages

- GitHub Actions `njzjz/wenxian` <= 0.3.1 → fixed: none listed

## Affected products (CVE record)

- njzjz wenxian: <= 0.3.1

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 2.78% probability of exploitation activity in the next 30 days; percentile 86.

## Sources

- [GitHub Advisory GHSA-r4fj-r33x-8v88](https://github.com/advisories/GHSA-r4fj-r33x-8v88)
- [CVE.org record CVE-2026-34243](https://www.cve.org/CVERecord?id=CVE-2026-34243)
- [NVD entry CVE-2026-34243](https://nvd.nist.gov/vuln/detail/CVE-2026-34243)
- [github.com](https://github.com/njzjz/wenxian/security/advisories/GHSA-r4fj-r33x-8v88)

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Source page: https://erroneo.us/security/cve/CVE-2026-34243/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt