{"id":"GHSA-2jf5-6wwv-vhxx","summary":"Inngest TypeScript SDK exposes environment variables via serve() handler on unhandled HTTP methods","details":"# Summary\n\nA vulnerability in the Inngest TypeScript SDK versions `3.22.0` through `3.53.1` allows unauthenticated remote attackers to exfiltrate environment variables from the host process via the `serve()` HTTP handler.\n\nThe `serve()` handler implements `GET`, `POST`, and `PUT` methods. Requests using `PATCH`, `OPTIONS`, or `DELETE` fall through to a generic handler that returns diagnostic information. A change introduced in `v3.22.0` caused this diagnostic response to include the contents of `process.env`, exposing any secrets, API keys, or credentials present in the environment.\n\n# Who is affected\n\nAn application is vulnerable if **all** of the following are true:\n\n- It uses `inngest` SDK version `\u003e= 3.22.0, \u003c= 3.53.1` (inclusive)\n- Its `serve()` endpoint is reachable via `PATCH`, `OPTIONS`, or `DELETE` requests.\n\nPlease check your framework's implementation for the serve handler ([documentation](https://www.inngest.com/docs/learn/serving-inngest-functions)) to asses whether it handles these HTTP methods. Common vulnerable configurations include:\n\n- Next.js Pages Router, which forwards all HTTP methods to the handler.\n- Express via `app.use('/api/inngest', serve(...))`, which routes `PATCH` and `OPTIONS` to the handler by default.\n\nThe following are **not** affected:\n\n- Next.js App Router handlers that explicitly export only `GET`, `POST`, and `PUT`.\n- Applications using the `connect` worker method.\n- SDK versions `\u003c 3.22.0` and `\u003e= 3.54.0`, including all `4.x` releases.\n\nThe vulnerability was responsibly disclosed by an Inngest user. At this time, there are no known reports of exploitation.\n\n# Remediation\n\n1. Upgrade to `inngest@3.54.0` or later. The fix is backwards compatible with the `3.x` release line. The `4.x` line is also unaffected.\n2. Rotate any secrets that were presence in environment variables (`process.env`) within affected environments including Inngest signing keys and event keys\n3. Search logs for any requests to your `serve` endpoints using the `PATCH`, `OPTIONS`, `DELETE` http methods to assess if any environment variables may have been exposed.\n\n## Additional recommendations\n\nUsers on platforms with long-lived deployments (e.g. Vercel, Cloudflare Workers) should be aware that prior deployments remain reachable at their immutable URLs and may continue to expose the vulnerability even after a new deployment is promoted. For example, Vercel offers security features such as \"[Deployment Protection](https://vercel.com/docs/deployment-protection#standard-protection)\" and [the ability to delete older deployments](https://vercel.com/kb/guide/how-do-i-delete-an-individual-deployment) which can help immediately mitigate impact.\n\nFor additional security, users can also adjust firewall or proxy rules to only allow requests to their `serve` endpoint from Inngest IP addresses available here: http://inngest.com/ips-v4, http://inngest.com/ips-v6\n\n### Workarounds\n\nIf upgrading is not immediately possible, restrict the `serve()` endpoint at the framework or reverse-proxy layer to accept only `GET`, `POST`, and `PUT`. The Inngest `serve()` endpoint does not require any other HTTP methods.\n\n### Resources\n\n- Rotating Inngest keys: https://www.inngest.com/docs/platform/manage/rotating-keys\n- Inngest signing keys: https://www.inngest.com/docs/platform/signing-keys\n- Inngest event keys: https://www.inngest.com/docs/events/creating-an-event-key\n- Inngest security best practices: https://www.inngest.com/docs/learn/security\n\n### Credits\n\n- Ben Hylak - an independent security researcher, discovered and responsibly disclosed the vulnerability.","aliases":["CVE-2026-42047"],"modified":"2026-05-11T13:53:13.460971Z","published":"2026-05-05T18:13:52Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-05-05T18:13:52Z","nvd_published_at":"2026-05-07T21:16:29Z","cwe_ids":["CWE-200","CWE-497"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/inngest/inngest-js/security/advisories/GHSA-2jf5-6wwv-vhxx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42047"},{"type":"PACKAGE","url":"https://github.com/inngest/inngest-js"},{"type":"WEB","url":"https://github.com/inngest/inngest-js/releases/tag/inngest%403.54.1"},{"type":"WEB","url":"https://vercel.com/docs/deployment-protection#standard-protection"},{"type":"WEB","url":"https://vercel.com/kb/guide/how-do-i-delete-an-individual-deployment"},{"type":"WEB","url":"https://www.inngest.com/docs/events/creating-an-event-key"},{"type":"WEB","url":"https://www.inngest.com/docs/learn/security"},{"type":"WEB","url":"https://www.inngest.com/docs/learn/serving-inngest-functions"},{"type":"WEB","url":"https://www.inngest.com/docs/platform/manage/rotating-keys"},{"type":"WEB","url":"https://www.inngest.com/docs/platform/signing-keys"}],"affected":[{"package":{"name":"inngest","ecosystem":"npm","purl":"pkg:npm/inngest"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.22.0"},{"fixed":"3.54.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-2jf5-6wwv-vhxx/GHSA-2jf5-6wwv-vhxx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"}]}