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CVE-2026-115779— Effect: Cookie attribute injection via domain, path, and name fields in @effect/platform makeCookie()

Quick assessment

Affected
Effect-TS effect
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Effect 是一个由多个协作包组成的 TypeScript 框架，旨在帮助构建 TypeScript 应用程序。在 @effect/platform 0.1.0 至 0.97.1 版本，以及 effect 4.0.0-beta.0 至 4.0.0-beta.103 版本中，传递给 makeCookie() 函数的 name（名称）、domain（域名）和 path（路径）字段允许使用分号作为分隔符，而 serializeCookie() 会将这些分号原样写入 Set-Cookie 响应头中。若调用方传入由攻击者控

CVSS 6.3 · Medium EPSS 0.63% · P50

Affected Version Matrix 2

VendorProduct Version RangeStatus
@effect platform >= 0.1.0, < 0.97.1 affected
Effect-TS effect >= 4.0.0-beta.0, < 4.0.0-beta.103 affected
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I. Basic Information for CVE-2026-115779

Vulnerability Information
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Vulnerability Title
Effect: Cookie attribute injection via domain, path, and name fields in @effect/platform makeCookie()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Effect-TS effect >= 4.0.0-beta.0, < 4.0.0-beta.103 -
@effect platform >= 0.1.0, < 0.97.1 -

II. Public POCs for CVE-2026-115779

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III. Intelligence Information for CVE-2026-115779

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Other References for CVE-2026-115779 (7)

IV. Related Vulnerabilities

Same product: effect
Same vendor: Effect-TS
Same weakness: CWE-74