{"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": "2026-09-15T14:47:58.804Z"}, "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"}}}}

{}

{"affected": [{"affectedData": [{"product": "conflibot", "vendor": "wktk", "versions": [{"status": "affected", "version": "< 1.2.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-55158", "lastModified": "2026-09-15T15:17:18.593", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-15T15:17:18.593", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/wktk/conflibot/commit/0107ac6a4575ea200d0b92287ea58f975be9505d"}, {"source": "security-advisories@github.com", "url": "https://github.com/wktk/conflibot/commit/59e255c49c920fd6b67471ab9ef3bf194439a3f2"}, {"source": "security-advisories@github.com", "url": "https://github.com/wktk/conflibot/pull/329"}, {"source": "security-advisories@github.com", "url": "https://github.com/wktk/conflibot/releases/tag/v1.2.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/wktk/conflibot/releases/tag/v2.0.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/wktk/conflibot/security/advisories/GHSA-2qvg-qr73-mqxp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}