What’s Vulnerable › Vulnerabilities

CVE-2026-33202: Rails Active Storage has possible glob injection in its DiskService

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-24 · updated 2026-06-17
• Weakness: CWE-74

Description

Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Storage's `DiskService#delete_prefixed` passes blob keys directly to `Dir.glob` without escaping glob metacharacters. If a blob key contains attacker-controlled input or custom-generated keys with glob metacharacters, it may be possible to delete unintended files from the storage directory. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Affected products

• Ruby on Rails: before 7.2.3.1; from 8.0.0 before 8.0.4.1; from 8.1.0 before 8.1.2.1 — fixed in 7.2.3.1, 8.0.4.1, 8.1.2.1
• Rubygems Activestorage: from 8.1.0.beta1 before 8.1.2.1; from 8.0.0.beta1 before 8.0.4.1; before 7.2.3.1; 8.1.0, 8.1.0.beta1, 8.1.0.rc1, 8.1.1, 8.1.2, 8.0.0 (+170) — fixed in 8.1.2.1, 8.0.4.1, 7.2.3.1

How to fix

Upgrade to a fixed version: Ruby on Rails 7.2.3.1, 8.0.4.1, 8.1.2.1; Rubygems Activestorage 8.1.2.1, 8.0.4.1, 7.2.3.1. Check the vendor advisory for mitigations.

References

• https://github.com/rails/rails/commit/8c9676b803820110548cdb7523800db43bc6874c
• https://github.com/rails/rails/commit/955284d26e469a9c026a4eee5b21f0414ab0bccf
• https://github.com/rails/rails/commit/fa19073546360856e9f4dab221fc2c5d73a45e82
• https://github.com/rails/rails/releases/tag/v7.2.3.1
• https://github.com/rails/rails/releases/tag/v8.0.4.1
• https://github.com/rails/rails/releases/tag/v8.1.2.1
• https://github.com/rails/rails/security/advisories/GHSA-73f9-jhhh-hr5m

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