{"cve":"CVE-2026-32887","nvd":{"published":"2026-03-20T22:16:27.980","modified":"2026-06-17T10:36:30.770","status":"Analyzed","description":"Effect is a TypeScript framework that consists of several packages that work together to help build TypeScript applications. Prior to version 3.20.0, when using `RpcServer.toWebHandler` (or `HttpApp.toWebHandlerRuntime`) inside a Next.js App Router route handler, any Node.js `AsyncLocalStorage`-dependent API called from within an Effect fiber can read another concurrent request's context — or no context at all. Under production traffic, `auth()` from `@clerk/nextjs/server` returns a different user's session. Version 3.20.0 contains a fix for the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4},"cwes":["CWE-362"],"references":["https://github.com/Effect-TS/effect/security/advisories/GHSA-38f7-945m-qr2g"],"products":["effectful:effect"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-32887","score":0.0028,"percentile":0.20573,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-38f7-945m-qr2g","url":"https://osv.dev/vulnerability/GHSA-38f7-945m-qr2g","summary":"Effect `AsyncLocalStorage` context lost/contaminated inside Effect fibers under concurrent load with RPC","modified":"2026-09-10T03:50:36.803601454Z","packages":[{"ecosystem":"npm","name":"effect","purl":"pkg:npm/effect","ranges":["<3.20.0"],"fixed":["3.20.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}