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Medium · 6.3 CVE-2026-115779 EUVD-2026-116496GHSA-chp3-j5qr-2vfr

Effect: Cookie attribute injection via domain, path, and name fields in @effect/platform makeCookie()

Published Nov 3, 2026 · Updated Nov 3, 2026 · Assigned by GitHub_M

Description

Effect is a TypeScript framework that consists of several packages that work together to help build TypeScript applications. From @effect/platform 0.1.0 until 0.97.1 and effect 4.0.0-beta.0 until 4.0.0-beta.103, the name, domain, and path fields passed to makeCookie() allow semicolon delimiters that serializeCookie() writes verbatim into Set-Cookie headers. A caller that supplies attacker-controlled values can append cookie attributes, including a broader Domain or, when the caller has not set those options itself, SameSite=None or Max-Age. Encoded cookie values and CR or LF characters remain unaffected. This can widen a cookie's scope or add otherwise-unset cookie attributes. This issue is fixed in @effect/platform 0.97.1 and effect 4.0.0-beta.103.

Affected products

VendorProductAffectedFixed
Effect-TS effect >= 4.0.0-beta.0, < 4.0.0-beta.103 —
@effect platform >= 0.1.0, < 0.97.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @effect/platform >= 0.1.0, < 0.97.1 0.97.1 GHSA-chp3-j5qr-2vfr
npm effect >= 4.0.0-beta.0, < 4.0.0-beta.103 4.0.0-beta.103 GHSA-chp3-j5qr-2vfr

References