CVE-2026-55158
- Source
- https://cve.org/CVERecord?id=CVE-2026-55158
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55158.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-55158
- Aliases
- Published
- 2026-09-15T14:47:58Z
- Modified
- 2026-10-28T02:30:33Z
- Severity
-
- 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- Conflibot: Command injection via crafted pull request branch names under pull_request_target
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-78" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55158.json" }- References
-
- https://github.com/wktk/conflibot/releases/tag/v1.2.1
- https://github.com/wktk/conflibot/releases/tag/v2.0.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55158.json
- https://github.com/wktk/conflibot/security/advisories/GHSA-2qvg-qr73-mqxp
- https://nvd.nist.gov/vuln/detail/CVE-2026-55158
- https://github.com/wktk/conflibot/commit/0107ac6a4575ea200d0b92287ea58f975be9505d
- https://github.com/wktk/conflibot/commit/59e255c49c920fd6b67471ab9ef3bf194439a3f2
- https://github.com/wktk/conflibot/pull/329
Affected packages
Git / github.com/wktk/conflibot
Affected ranges
- Type
- GIT
- Repo
- https://github.com/wktk/conflibot
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "1.2.1" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "0107ac6a4575ea200d0b92287ea58f975be9505d" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "59e255c49c920fd6b67471ab9ef3bf194439a3f2" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v1.2.1", "range": [ { "fixed": "59e255c49c920fd6b67471ab9ef3bf194439a3f2" } ], "source": "REFERENCES_TAG" }, { "original_tag": "v2.0.0", "range": [ { "fixed": "401bde09ac47fb11375ecf9fb663970532995776" } ], "source": "REFERENCES_TAG" } ] }