CVE-2026-34243Public exploitNetwork attack vector

Arbitrary code execution via unsafe issue comment interpolation

Published Mar 31, 2026 · Updated Mar 31, 2026

Command injection in Jinzhe Zeng wenxian 0.3.1 and earlier allows remote attackers to execute arbitrary code via GitHub issue comments. The issue-comment workflow interpolates github.event.comment.body into a run shell command before execution without neutralizing shell syntax. Posting a crafted comment to an issue that triggers the workflow is enough to run commands as the GitHub Actions runner and expose its token and repository data.

CVSS severity9.8
Critical
EPSS probability2.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Jinzhe Zeng wenxian 0.3.1 and earlier allows remote attackers to execute arbitrary code via GitHub issue comments. The issue-comment workflow interpolates github.event.comment.body into a run shell command before execution without neutralizing shell syntax. Posting a crafted comment to an issue that triggers the workflow is enough to run commands as the GitHub Actions runner and expose its token and repository data.

The record

CVE
CVE-2026-34243
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
Jinzhe Zeng
Product
wenxian
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jinzhe Zeng · wenxianversion=<= 0.3.1

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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