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.
Metrics
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Effect-TS | effect | >= 4.0.0-beta.0, < 4.0.0-beta.103 |
| @effect | platform | >= 0.1.0, < 0.97.1 |
References
- 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
- https://github.com/Effect-TS/effect/releases/tag/@effect/platform@0.97.1
- https://github.com/Effect-TS/effect/releases/tag/effect@4.0.0-beta.103
- https://github.com/Effect-TS/effect/security/advisories/GHSA-chp3-j5qr-2vfr
Timeline
- Published
- Nov 3, 2026
- Last modified
- Nov 12, 2026
- NVD status
- Awaiting Analysis