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pay-rails/pay: non-constant-time HMAC comparison in Paddle Billing webhook signature verifier

CVSS 3.1 7.4 HIGHCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-70658

Published

Pay is a payments engine for Ruby on Rails 6.0 and higher. Prior to 11.6.2, Pay::Webhooks::PaddleBillingController#valid_signature? in app/controllers/pay/webhooks/paddle_billing_controller.rb compares the computed 64-character SHA-256 HMAC with the attacker-controlled h1 token from the Paddle-Signature header using Ruby String#==. An unauthenticated remote attacker who can repeatedly submit requests to /pay/webhooks/paddle_billing and obtain sufficiently precise timing measurements can infer matching digest prefixes and recover a valid signature. A forged accepted webhook is enqueued through Pay::Webhooks::ProcessJob and can cause a host application to update billing state, provision paid features, record refunds, or trigger customer notifications. This issue is fixed in version 11.6.2.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-70658

Published

pay

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "pay-rails",
                    "product": "pay",
                    "versions": [
                        {
                            "version": "< 11.6.2",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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Sources read 13 Nov 15:18 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current