What is CVE-2026-33202?

CVE-2026-33202 is a critical-severity vulnerability in Rails Activestorage, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.1/10. Published 2026-03-24.

How severe is CVE-2026-33202?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Rails Activestorage

CVE-2026-33202

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.

Published 2026-03-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (50.0th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Rails Activestorage — versions >= 8.1.0.beta1, < 8.1.2.1, >= 8.0.0.beta1, < 8.0.4.1, < 7.2.3.1
Rubyonrails Rails

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

github.com/rails/rails/security/advisories/GHSA-73f9-jhhh-hr5m (Vendor Advisory)
github.com/rails/rails/commit/8c9676b803820110548cdb7523800db43bc6874c (Patch)
github.com/rails/rails/commit/955284d26e469a9c026a4eee5b21f0414ab0bccf (Patch)
github.com/rails/rails/commit/fa19073546360856e9f4dab221fc2c5d73a45e82 (Patch)
github.com/rails/rails/releases/tag/v7.2.3.1 (Release Notes)
github.com/rails/rails/releases/tag/v8.0.4.1 (Release Notes)
github.com/rails/rails/releases/tag/v8.1.2.1 (Release Notes)

Frequently asked questions

What is CVE-2026-33202?: CVE-2026-33202 is a critical-severity vulnerability in Rails Activestorage, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.1/10. Published 2026-03-24.
How severe is CVE-2026-33202?: Critical severity. CVSS v3 base score is 9.1 out of 10.