{"id":"CVE-2026-86081","aliases":["EUVD-2026-74275","GHSA-j535-v25q-vx3q","ROOT-APP-NPM-CVE-2026-86081"],"status":"published","title":"n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path","description":"n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0056,"percentile":0.4713,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2026-09-08T21:24:20Z","modified":"2026-10-28T02:30:44Z","fixes":[{"ecosystem":"npm","package":"n8n","fixed_in":["1.123.76","2.38.2","2.37.7"],"sources":["ghsa","osv"]},{"ecosystem":"Root:npm","package":"n8n","fixed_in":["2.19.3-aikido.10","2.19.3-aikido.11","2.19.3-aikido.12","2.19.3-aikido.13","2.19.3-aikido.14","2.19.3-aikido.15"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/n8n","fixed_in":["2.19.3-root.io.10","2.19.3-root.io.11","2.19.3-root.io.12","2.19.3-root.io.13","2.19.3-root.io.14","2.19.3-root.io.15"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"n8n","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.123.76"}]}]},{"source":"ghsa","ecosystem":"npm","package":"n8n","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.38.0"},{"fixed":"2.38.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"n8n","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.37.7"}]}]},{"source":"osv","ecosystem":"npm","package":"n8n","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.123.76"}]}]},{"source":"osv","ecosystem":"npm","package":"n8n","ranges":[{"type":"SEMVER","events":[{"introduced":"2.38.0"},{"fixed":"2.38.2"}]}]},{"source":"osv","ecosystem":"npm","package":"n8n","ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.37.7"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"n8n","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.19.3-aikido.10"},{"fixed":"2.19.3-aikido.11"},{"fixed":"2.19.3-aikido.12"},{"fixed":"2.19.3-aikido.13"},{"fixed":"2.19.3-aikido.14"},{"fixed":"2.19.3-aikido.15"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@rootio/n8n","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.19.3-root.io.10"},{"fixed":"2.19.3-root.io.11"},{"fixed":"2.19.3-root.io.12"},{"fixed":"2.19.3-root.io.13"},{"fixed":"2.19.3-root.io.14"},{"fixed":"2.19.3-root.io.15"}]}]}],"products":[{"vendor":"n8n-io","product":"n8n"}],"references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-j535-v25q-vx3q","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86081","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j535-v25q-vx3q"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86081.json","tags":["advisory"]},{"url":"https://github.com/n8n-io/n8n","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-86081","title":"n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path","description":"n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.","status":"published","published":"2026-09-08T21:24:20.936Z","modified":"2026-09-09T13:45:42.273Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T13:49:31.546614Z"}],"euvd":[{"id":"EUVD-2026-74275","description":"n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.","status":"published","published":"2026-09-08T21:24:20Z","modified":"2026-09-09T13:45:42Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:28:27.325238Z"}],"ghsa":[{"id":"GHSA-j535-v25q-vx3q","title":"n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path","description":"## Impact\n\nThe Git node's clone operation matched the destination path against the default `N8N_BLOCK_FILE_PATTERNS` expression, which was written so that a crafted path caused catastrophic backtracking. Evaluation runs synchronously in the main n8n process, so an authenticated user could freeze the instance for everyone with a single workflow execution and no unusual configuration. The patch rewrites the pattern so that matching is linear in the length of the path.\n\n## Patches\n\nThe issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\n\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict n8n instance access to fully trusted users only.\n- Disable the Git node by adding `n8n-nodes-base.git` to the `NODES_EXCLUDE` environment variable.\n- Set `N8N_BLOCK_FILE_PATTERNS` to a backtracking-safe equivalent pattern to replace the vulnerable default.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","status":"published","published":"2026-09-10T15:12:00Z","modified":"2026-09-10T15:12:01Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:41:15.803194Z"}],"nvd":[{"id":"CVE-2026-86081","description":"n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.","status":"published","published":"2026-09-08T22:19:17.093Z","modified":"2026-09-09T20:16:54.383Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:12:45.612639Z"}],"osv":[{"id":"CVE-2026-86081","title":"n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path","description":"n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.","status":"published","published":"2026-09-08T21:24:20.936Z","modified":"2026-10-28T02:30:44.759161577Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:45:18.825071Z"},{"id":"GHSA-j535-v25q-vx3q","title":"n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path","description":"## Impact\n\nThe Git node's clone operation matched the destination path against the default `N8N_BLOCK_FILE_PATTERNS` expression, which was written so that a crafted path caused catastrophic backtracking. Evaluation runs synchronously in the main n8n process, so an authenticated user could freeze the instance for everyone with a single workflow execution and no unusual configuration. The patch rewrites the pattern so that matching is linear in the length of the path.\n\n## Patches\n\nThe issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\n\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict n8n instance access to fully trusted users only.\n- Disable the Git node by adding `n8n-nodes-base.git` to the `NODES_EXCLUDE` environment variable.\n- Set `N8N_BLOCK_FILE_PATTERNS` to a backtracking-safe equivalent pattern to replace the vulnerable default.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","status":"published","published":"2026-09-10T15:12:00Z","modified":"2026-09-10T15:30:04.749866465Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:49.977351Z"},{"id":"ROOT-APP-NPM-CVE-2026-86081","title":"CVE-2026-86081 in n8n - Patched by Root","description":"Root has patched CVE-2026-86081 in the n8n package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-06T03:42:47Z","modified":"2026-10-06T04:15:03.063644245Z","updated_at":"2026-11-02T15:53:27.649662Z"}]}}