CVE-2026-115779

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CVE-2026-115779

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

Details: 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.

References: https://github.com/Effect-TS/effect/releases/tag/@effect/[email protected], https://github.com/Effect-TS/effect/releases/tag/[email protected], https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115779.json, https://github.com/Effect-TS/effect/security/advisories/GHSA-chp3-j5qr-2vfr, https://nvd.nist.gov/vuln/detail/CVE-2026-115779, https://github.com/Effect-TS/effect/commit/4a57af24011db1d66e947289d2f7ffc2074696d2, https://github.com/Effect-TS/effect/commit/5859b373b9be04d5037a594196b4743ad80379bd, https://github.com/Effect-TS/effect/pull/6763, https://github.com/Effect-TS/effect/pull/6765