CVE-2026-70658 - pay-rails/pay: non-constant-time HMAC comparison in Paddle Billing webhook signature verifier

CVE-2026-70658 - pay-rails/pay: non-constant-time HMAC comparison in Paddle Billing webhook signature verifier

https://cvefeed.io/rssfeed/latest.atom / Mon, 09/14/2026 - 22:32
CVE ID :CVE-2026-70658
Published : Sept. 14, 2026, 6:19 p.m. | 47 minutes ago
Description :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.
Severity: 7.4 | HIGH
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