CVE-2026-32887 | Effect-TS effect up to 3.19.x API Call race condition (GHSA-38f7-945m-qr2g)

VDB-352143 · CVE-2026-32887 · GHSA-38F7-945M-QR2G EFFECT-TS EFFECT UP TO 3.19.X API CALL RACE CONDITION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.4 $0-$5k 1.52+ Summaryinfo A vulnerability, which was classified as problematic, has been found in Effect-TS effect up to 3.19.x. Affected by this vulnerability is the function RpcServer.toWebHandler/HttpApp.toWebHandlerRuntime of the component API Call Handler. Performing a manipulation results in race condition. This vulnerability was named CVE-2026-32887. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as problematic has been found in Effect-TS effect up to 3.19.x. This affects the function RpcServer.toWebHandler/HttpApp.toWebHandlerRuntime of the component API Call Handler. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-32887 since 03/16/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 3.20.0 eliminates this vulnerability. Productinfo Vendor Effect-TS Name effect Version 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 Website Product: https://github.com/Effect-TS/effect/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.5 VulDB Meta Temp Score: 6.4 VulDB Base Score: 5.6 VulDB Temp Score: 5.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.4 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Race condition CWE: CWE-362 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: effect 3.20.0 Timelineinfo 03/16/2026 CVE reserved 03/20/2026 +4 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-38f7-945m-qr2g Status: Confirmed CVE: CVE-2026-32887 (🔒) GCVE (CVE): GCVE-0-2026-32887 GCVE (VulDB): GCVE-100-352143 Entryinfo Created: 03/20/2026 23:34 Changes: 03/20/2026 23:34 (65) Complete: 🔍 Cache ID: 99:1F7:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸