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Medium, CVSS 5.3

Sinatra vulnerable to Reliance on Untrusted Inputs in a Security Decision

CVE-2024-21510GHSA-hxx2-7vcw-mqr3

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (sinatra 4.1.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • RubyGems sinatra

    Affected
    < 4.1.0
    Fixed in
    4.1.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2024-21510: 0.49% estimated exploitation activity in the next 30 days; percentile 42.43 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Versions of the package sinatra from 0.0.0 are vulnerable to Reliance on Untrusted Inputs in a Security Decision via the X-Forwarded-Host (XFH) header. When making a request to a method with redirect applied, it is possible to trigger an Open Redirect Attack by inserting an arbitrary address into this header. If used for caching purposes, such as with servers like Nginx, or as a reverse proxy, without handling the X-Forwarded-Host header, attackers can potentially exploit Cache Poisoning or Routing-based SSRF.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hxx2-7vcw-mqr3

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-21510

Advisory: Sinatra vulnerable to Reliance on Untrusted Inputs in a Security Decision
IDs: CVE-2024-21510, GHSA-hxx2-7vcw-mqr3
Record: https://patchnext.com/advisories/cve-2024-21510 (revision 1, source checked 26 Oct 2026, 15:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: sinatra 4.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems sinatra: affected < 4.1.0; fixed in 4.1.0

## Suggested inspection (read-only)
- RubyGems sinatra: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on sinatra.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hxx2-7vcw-mqr3 (GitHub-reviewed advisory GHSA-hxx2-7vcw-mqr3 lists affected ranges: RubyGems sinatra >=0 <4.1.0)

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