CVE-2026-33173

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Source
https://cve.org/CVERecord?id=CVE-2026-33173
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33173.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33173
Aliases
Downstream
Related
Published
2026-03-23T23:21:29.843Z
Modified
2026-04-10T05:42:38.774238Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Rails Active Storage has possible content type bypass via metadata in direct uploads
Details

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, DirectUploadsController accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like identified and analyzed are stored in the same metadata hash, a direct-upload client can set these flags to skip MIME detection and analysis. This allows an attacker to upload arbitrary content while claiming a safe content_type, bypassing any validations that rely on Active Storage's automatic content type identification. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Database specific 
{
    "cwe_ids": [
        "CWE-925"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33173.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/rails/rails

Affected ranges

Type
GIT
Repo
https://github.com/rails/rails
Events
Introduced
80827ca7ff33ca3026f2c74fe8249ccc6f513318
Fixed
1db4b89687cc18311fc3f92623136705df24e671
Database specific 
{
    "versions": [
        {
            "introduced": "8.1.0.beta1"
        },
        {
            "fixed": "8.1.2.1"
        }
    ]
}
Type
GIT
Repo
https://github.com/rails/rails
Events
Introduced
72bc36fb47aa3a9b10149ecefc1f344d7b028d79
Fixed
a79efed95797b196575a98845dc989e3106a9acb
Database specific 
{
    "versions": [
        {
            "introduced": "8.0.0.beta1"
        },
        {
            "fixed": "8.0.4.1"
        }
    ]
}
Type
GIT
Repo
https://github.com/rails/rails
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ba76fca032a66f3716ca8a661c9ddb006acaf885
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "7.2.3.1"
        }
    ]
}

Affected versions

v0.*
v0.10.0
v0.10.1
v0.11.0
v0.11.1
v0.12.0
v0.13.0
v0.13.1
v0.14.1
v0.14.3
v0.9.1
v0.9.2
v0.9.3
v0.9.4
v0.9.4.1
v0.9.5
v1.*
v1.1.0
v1.1.0_RC1
v1.1.1
v2.*
v2.0.0
v2.0.0_PR
v2.0.0_RC1
v2.0.0_RC2
v2.0.1
v3.*
v3.0.0.beta.3
v3.0.0.beta3
v3.1.0.beta1
v3.1.0.rc1
v3.2.0.rc1
v4.*
v4.0.0.beta1
v4.0.0.rc1
v4.2.0.beta1
v5.*
v5.0.0.beta1
v5.0.0.beta2
v5.0.0.beta4
v5.1.0.beta1
v6.*
v6.0.0.beta1
v6.0.0.beta2
v6.1.0.rc1
v7.*
v7.0.0.alpha1
v7.0.0.alpha2
v7.1.0.beta1
v7.2.0.beta1
v7.2.0.beta2
v7.2.0.beta3
v7.2.0.rc1
v7.2.1
v7.2.2
v7.2.3
v8.*
v8.0.0
v8.0.0.beta1
v8.0.0.rc1
v8.0.0.rc2
v8.0.1
v8.0.2
v8.0.3
v8.0.4
v8.1.0
v8.1.0.beta1
v8.1.0.rc1
v8.1.1
v8.1.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33173.json"