No VulnCrest analysis published for this CVE yet. Below is the original CNA/NVD description, unmodified.
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.
Exploits & detection
No public PoC or detection template found yet.
Timeline
- Published: 03 Nov 2026
- Last modified upstream: 12 Nov 2026
Sources & licenses
- CVE / CVSS / CWE
- NVD record ↗ (unmodified). This product uses the NVD API but is not endorsed or certified by the NVD. CVE® © The MITRE Corporation.
- Exploitation
- CISA KEV (CC0) · EPSS by FIRST.org
- References used for the analysis
- 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/[email protected]
- https://github.com/Effect-TS/effect/releases/tag/[email protected]
- https://github.com/Effect-TS/effect/security/advisories/GHSA-chp3-j5qr-2vfr
- Analysis, summary and remediation
- © VulnCrest