CVE-2026-55158Network attack vectorHinoki check available

Command execution via interpolated pull request branch names

Published Sep 15, 2026 · Updated Sep 15, 2026

OS command injection in wktk conflibot before 1.2.1 allows remote attackers to execute commands through crafted pull request branch names. In src/index.ts, git checkout, git merge, and git format-patch strings interpolate head.ref and pass the results to a shell-capable exec call. A pull_request_target workflow runs automatically for a forked pull request, allowing secret exfiltration and unauthorized repository pushes.

CVSS severity9.1
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

OS command injection in wktk conflibot before 1.2.1 allows remote attackers to execute commands through crafted pull request branch names. In src/index.ts, git checkout, git merge, and git format-patch strings interpolate head.ref and pass the results to a shell-capable exec call. A pull_request_target workflow runs automatically for a forked pull request, allowing secret exfiltration and unauthorized repository pushes.

The record

CVE
CVE-2026-55158
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
wktk
Product
conflibot
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=< 1.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

wktk · conflibotversion=< 1.2.1

Published CVSS scores

9.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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