CVE-2026-115779: effect · Injection
Affects effectSource CVE Database V5
Not known to be exploited · CVSS 6.3 Medium : upgrade to 4.0.0-beta.103 when convenient.
Data as of 3 Nov 2026, 21:44 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 4.0 | 6.3 |
|---|
- Patch
- Available – fixed in 4.0.0-beta.103, 0.97.1
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
Upgrade effect to 4.0.0-beta.103; platform to 0.97.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Effect-TSeffect | Affected
| Fixed in
|
| @effectplatform | Affected
| Fixed in
|
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.
References
- github.com/Effect-TS/effect/security/advisories/GHSA-chp3-j5qr-2vfr (opens in a new tab)
- github.com/Effect-TS/effect/pull/6763 (opens in a new tab)
- github.com/Effect-TS/effect/pull/6765 (opens in a new tab)
- github.com/Effect-TS/effect/commit/4a57af24011db1d66e947289d2f7ffc2074696d2 (opens in a new tab)
- github.com/Effect-TS/effect/commit/5859b373b9be04d5037a594196b4743ad80379bd (opens in a new tab)
- github.com/Effect-TS/effect/releases/tag/@effect/platform@0.97.1 (opens in a new tab)
- github.com/Effect-TS/effect/releases/tag/effect@4.0.0-beta.103 (opens in a new tab)