{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55158","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-16T15:13:28.165Z","datePublished":"2026-09-15T14:47:58.804Z","dateUpdated":"2026-09-17T14:42:35.993Z"},"containers":{"cna":{"title":"Conflibot: Command injection via crafted pull request branch names under pull_request_target","problemTypes":[{"descriptions":[{"cweId":"CWE-78","lang":"en","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/wktk/conflibot/security/advisories/GHSA-2qvg-qr73-mqxp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/wktk/conflibot/security/advisories/GHSA-2qvg-qr73-mqxp"},{"name":"https://github.com/wktk/conflibot/pull/329","tags":["x_refsource_MISC"],"url":"https://github.com/wktk/conflibot/pull/329"},{"name":"https://github.com/wktk/conflibot/commit/0107ac6a4575ea200d0b92287ea58f975be9505d","tags":["x_refsource_MISC"],"url":"https://github.com/wktk/conflibot/commit/0107ac6a4575ea200d0b92287ea58f975be9505d"},{"name":"https://github.com/wktk/conflibot/commit/59e255c49c920fd6b67471ab9ef3bf194439a3f2","tags":["x_refsource_MISC"],"url":"https://github.com/wktk/conflibot/commit/59e255c49c920fd6b67471ab9ef3bf194439a3f2"},{"name":"https://github.com/wktk/conflibot/releases/tag/v1.2.1","tags":["x_refsource_MISC"],"url":"https://github.com/wktk/conflibot/releases/tag/v1.2.1"},{"name":"https://github.com/wktk/conflibot/releases/tag/v2.0.0","tags":["x_refsource_MISC"],"url":"https://github.com/wktk/conflibot/releases/tag/v2.0.0"}],"affected":[{"vendor":"wktk","product":"conflibot","versions":[{"version":"< 1.2.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-15T14:47:58.804Z"},"descriptions":[{"lang":"en","value":"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":{"advisory":"GHSA-2qvg-qr73-mqxp","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T14:42:13.306848Z","id":"CVE-2026-55158","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-17T14:42:35.993Z"}}]}}