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CVE-2026-55158— Conflibot: Command injection via crafted pull request branch names under pull_request_target

Quick assessment

Affected
wktk conflibot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Conflibot 能够在合并 Pull Request（PR）之前，提前提示该操作是否会在其他已打开的 PR 中引发冲突。在 1.2.1 版本之前， 通过字符串插值方式构建 、 和 命令，其中直接拼接了攻击者可控制的 Pull Request 的 值到传递给 的字符串中。在已记录的 配置下，攻击者可以提交一个 Pull Request（包括来自 fork 仓库的 PR），其分支名中包含 shell 元字符（如 、 、 等），工作流会自动将这些字符解释为命令执行，无需维护者交互。这些命令在拥有基础仓库 secret

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-55158

Vulnerability Information
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Vulnerability Title
Conflibot: Command injection via crafted pull request branch names under pull_request_target
Source: CVE Program / CVE List V5
Vulnerability Description
Conflibot warns in advance when merging a pull request will cause conflicts in other open pull requests. Prior to 1.2.1, src/index.ts builds git checkout, git merge, and git format-patch commands by interpolating the attacker-controlled pull request head.ref value into strings passed to exec. In the documented pull_request_target configuration, an attacker can open a pull request, including from a fork, whose branch name contains shell metacharacters, and the workflow automatically interprets those characters as commands without maintainer interaction. The commands execute on a runner with base-repository secrets and a write-scoped GITHUB_TOKEN, allowing arbitrary command execution, secret or token exfiltration, unauthorized pushes, and other token abuse. The fixed implementations in src/index.ts and src/conflibot.ts use execFile or spawn argument arrays, and the v2 line also uses numeric pull-request refs rather than branch names. This issue is fixed in versions 1.2.1 and 2.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wktk conflibot < 1.2.1 -

II. Public POCs for CVE-2026-55158

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III. Intelligence Information for CVE-2026-55158

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Patches & Fixes for CVE-2026-55158 (3)

Vendor Advisories for CVE-2026-55158 (1)

Vendor Pages for CVE-2026-55158 (2)

IV. Related Vulnerabilities

Same weakness: CWE-78

V. Comments for CVE-2026-55158

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