Interpretation Conflict Affecting rails package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.42% (37th percentile)

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  • Snyk IDSNYK-ECHOLATEST-RAILS-22412392
  • published11 Nov 2026
  • disclosed10 Nov 2026

Introduced: 10 Nov 2026

NewCVE-2026-126073  (opens in a new tab)
CWE-436  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest rails.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rails package and not the rails package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, Action Pack negotiates the format of a rendered response from the Accept, X-Requested-With and, for XHR requests without Accept, Content-Type request headers, but ActionController::Rendering#_set_vary_header adds Vary: Accept only when the request carries a usable Accept header and the response has no Vary header yet. A response to a request without Accept, or to an XHR request, therefore omits the headers that selected its representation, and a response whose Vary the application set before rendering (for example Vary: Accept-Language) never gains Accept. A shared cache that honours Vary could store such a response and serve it to later clients that request a different representation, possibly leading to cache poisoning in which visitors receive, until the entry expires, a page without its layout or HTML in place of JSON. The attacker cannot choose the content of the response. Applications that render negotiated responses from actions marked public (for example with expires_in ..., public: true) behind a shared cache that honours Vary, such as Thruster or Rack::Cache, are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.

CVSS Base Scores

version 3.1