CVE-2026-55576Public exploitNetwork attack vector

CI runner command execution via PR-title injection

Published Jul 15, 2026 · Updated Jul 15, 2026

OS command injection in MaaAssistantArknights allows remote attackers to execute commands on its GitHub Actions runner via a crafted pull-request title. The release-preparation.yml workflow inserts github.event.pull_request.title directly into a Bash run block, so shell metacharacters and command substitutions become executable code. A non-draft fork pull request with a Release v title triggers the job without maintainer interaction, but the fork token is read-only and receives no repository secrets.

CVSS severity8.8
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in MaaAssistantArknights allows remote attackers to execute commands on its GitHub Actions runner via a crafted pull-request title. The release-preparation.yml workflow inserts github.event.pull_request.title directly into a Bash run block, so shell metacharacters and command substitutions become executable code. A non-draft fork pull request with a Release v title triggers the job without maintainer interaction, but the fork token is read-only and receives no repository secrets.

The record

CVE
CVE-2026-55576
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
MaaAssistantArknights
Product
MaaAssistantArknights
Classifications
CWE-78, CWE-94, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< cafc3946059e6337d2089d4fec8b6885ba17c332

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MaaAssistantArknights · MaaAssistantArknightsversion=< cafc3946059e6337d2089d4fec8b6885ba17c332

Published CVSS scores

8.8GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

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-94Improper Control of Generation of Code ('Code 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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