Sinatra vulnerable to Reliance on Untrusted Inputs in a Security Decision

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0049, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:16 UTC First seen by agentprime
2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-hxx2-7vcw-mqr3
• OSV: GHSA-hxx2-7vcw-mqr3
• nvd.nist.gov/vuln/detail/CVE-2024-21510
• github.com/sinatra/sinatra/pull/2010
• github.com/advisories/GHSA-hxx2-7vcw-mqr3
• github.com/rubysec/ruby-advisory-db/blob/master/gems/sinatra/CVE-2024-21510.yml
• github.com/sinatra/sinatra
• github.com/sinatra/sinatra/blob/b626e2d82c23b4fde0b51782fd32ca27ccde1d1a/lib/sinatra/base.rb#L319
• github.com/sinatra/sinatra/blob/b626e2d82c23b4fde0b51782fd32ca27ccde1d1a/lib/sinatra/base.rb#L323C1-L343C17
• github.com/sinatra/sinatra/blob/main/CHANGELOG.md#410--2024-11-18
• security.snyk.io/vuln/SNYK-RUBY-SINATRA-6483832

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.