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
CGA (58)
DEBIAN (1)
MINI (3)
UBUNTU (1)
Published
2026-03-23T23:09:48Z
Modified
2026-10-21T02:30:55Z
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 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33170.json"
}
References

Affected packages

Git / github.com/rails/rails

Affected ranges

Type
GIT
Repo
https://github.com/rails/rails
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ba76fca032a66f3716ca8a661c9ddb006acaf885
Introduced
dd8f7185faeca6ee968a6e9367f6d8601a83b8db
Fixed
a79efed95797b196575a98845dc989e3106a9acb
Introduced
1cdd190a25e483b65f1f25bbd0f13a25d696b461
Fixed
1db4b89687cc18311fc3f92623136705df24e671
Fixed
50d732af3b7c8aaf63cbcca0becbc00279b215b7
Fixed
6e8a81108001d58043de9e54a06fca58962fc2db
Fixed
c1ad0e8e1972032f3395853a5e99cea035035beb
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "7.2.3.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "8.0.0"
                },
                {
                    "fixed":  "8.0.4.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "8.1.0"
                },
                {
                    "fixed":  "8.1.2.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "50d732af3b7c8aaf63cbcca0becbc00279b215b7"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "6e8a81108001d58043de9e54a06fca58962fc2db"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "c1ad0e8e1972032f3395853a5e99cea035035beb"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v7.2.3.1",
            "range":  [
                {
                    "fixed":  "ba76fca032a66f3716ca8a661c9ddb006acaf885"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v8.0.4.1",
            "range":  [
                {
                    "fixed":  "a79efed95797b196575a98845dc989e3106a9acb"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v8.1.2.1",
            "range":  [
                {
                    "fixed":  "1db4b89687cc18311fc3f92623136705df24e671"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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
v8.0.1
v8.0.2
v8.0.3
v8.0.4
v8.1.0
v8.1.1
v8.1.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33170.json"