CVE-2026-33170

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Source
https://cve.org/CVERecord?id=CVE-2026-33170
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33170.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33170
Aliases
Downstream
Related
Published
2026-03-23T23:09:48.923Z
Modified
2026-04-10T05:42:38.705908Z
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 Support has a possible XSS vulnerability in SafeBuffer#%
Details

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, SafeBuffer#% does not propagate the @html_unsafe flag to the newly created buffer. If a SafeBuffer is mutated in place (e.g. via gsub!) and then formatted with % using untrusted arguments, the result incorrectly reports html_safe? == true, bypassing ERB auto-escaping and possibly leading to XSS. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33170.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ]
}
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-2026-33170.json"