CVE-2026-39315

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Source
https://cve.org/CVERecord?id=CVE-2026-39315
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39315.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39315
Aliases
Published
2026-04-09T17:54:07.488Z
Modified
2026-07-08T08:12:28.133761523Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
Unhead has a hasDangerousProtocol() bypass via leading-zero padded HTML entities in useHeadSafe()
Details

Unhead is a document head and template manager. Prior to 2.1.13, useHeadSafe() is the composable that Nuxt's own documentation explicitly recommends for rendering user-supplied content in <head> safely. Internally, the hasDangerousProtocol() function in packages/unhead/src/plugins/safe.ts decodes HTML entities before checking for blocked URI schemes (javascript:, data:, vbscript:). The decoder uses two regular expressions with fixed-width digit caps. The HTML5 specification imposes no limit on leading zeros in numeric character references. When a padded entity exceeds the regex digit cap, the decoder silently skips it. The undecoded string is then passed to startsWith('javascript:'), which does not match. makeTagSafe() writes the raw value directly into SSR HTML output. The browser's HTML parser decodes the padded entity natively and constructs the blocked URI. This vulnerability is fixed in 2.1.13.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39315.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-184"
    ]
}
References

Affected packages

Git / github.com/unjs/unhead

Affected ranges

Type
GIT
Repo
https://github.com/unjs/unhead
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
6a16082a7d1cb32933507f0f2fcf4fdea1a26f4a
Fixed
961ea781e091853812ffe17f8cda17105d2d2299
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:unjs:unhead:*:*:*:*:*:node.js:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.1.13"
        }
    ]
}

Affected versions

2.*
2.0.0-rc.6
v0.*
v0.0.1
v0.0.2
v0.0.3
v0.0.4
v0.0.5
v0.0.6
v0.0.7
v0.1.0
v0.1.1
v0.1.2
v0.1.3
v0.1.4
v0.2.0
v0.2.1
v0.2.2
v0.2.3
v0.2.4
v0.2.5
v0.2.6
v0.2.7
v0.3.0
v0.3.1
v0.4.0
v0.4.1
v0.4.2
v0.4.3
v0.4.4
v0.4.5
v0.4.6
v0.4.7
v0.4.8
v0.5.0
v0.5.1
v0.6.0
v0.6.1
v0.6.2
v0.6.3
v0.6.4
v0.6.5
v0.6.6
v0.6.7
v0.6.8
v0.6.9
v0.7.0
v0.7.1
v1.*
v1.0.0
v1.0.1
v1.0.10
v1.0.11
v1.0.12
v1.0.13
v1.0.15
v1.0.16
v1.0.17
v1.0.18
v1.0.19
v1.0.2
v1.0.20
v1.0.21
v1.0.22
v1.0.3
v1.0.4
v1.0.5
v1.0.6
v1.0.7
v1.0.8
v1.0.9
v1.1.0
v1.1.1
v1.1.10
v1.1.11
v1.1.12
v1.1.13
v1.1.14
v1.1.16
v1.1.17
v1.1.2
v1.1.24
v1.1.25
v1.1.26
v1.1.27
v1.1.28
v1.1.29
v1.1.3
v1.1.30
v1.1.31
v1.1.32
v1.1.33
v1.1.34
v1.1.35
v1.1.4
v1.1.5
v1.1.6
v1.1.7
v1.1.8
v1.1.9
v1.10.0
v1.10.0-beta.1
v1.10.0-beta.2
v1.10.0-beta.3
v1.10.0-beta.4
v1.10.0-beta.5
v1.10.0-beta.6
v1.11.15
v1.11.8
v1.11.9
v1.2.0
v1.2.1
v1.2.2
v1.3.0
v1.3.1
v1.3.2
v1.3.3
v1.3.4
v1.3.5
v1.3.6
v1.3.7
v1.3.8
v1.3.9
v1.4.0
v1.4.1
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v1.5.5
v1.6.0
v1.6.1
v1.6.2
v1.7.0
v1.7.1
v1.7.2
v1.7.3
v1.7.4
v1.7.5
v1.8.0
v1.8.1
v1.8.10
v1.8.11
v1.8.12
v1.8.13
v1.8.14
v1.8.15
v1.8.16
v1.8.17
v1.8.18
v1.8.19
v1.8.2
v1.8.20
v1.8.3
v1.8.4
v1.8.5
v1.8.6
v1.8.7
v1.8.8
v1.8.9
v1.9.0
v1.9.1
v1.9.10
v1.9.11
v1.9.12
v1.9.13
v1.9.14
v1.9.15
v1.9.16
v1.9.2
v1.9.3
v1.9.4
v1.9.5
v1.9.6
v1.9.7
v1.9.8
v1.9.9
v2.*
v2.0.0
v2.0.0-alpha.0
v2.0.0-alpha.1
v2.0.0-alpha.2
v2.0.0-alpha.20
v2.0.0-alpha.21
v2.0.0-alpha.22
v2.0.0-alpha.23
v2.0.0-alpha.24
v2.0.0-alpha.25
v2.0.0-alpha.26
v2.0.0-alpha.27
v2.0.0-alpha.28
v2.0.0-alpha.29
v2.0.0-alpha.3
v2.0.0-alpha.30
v2.0.0-alpha.31
v2.0.0-alpha.32
v2.0.0-alpha.4
v2.0.0-alpha.5
v2.0.0-alpha.6
v2.0.0-alpha.7
v2.0.0-beta.0
v2.0.0-beta.1
v2.0.0-beta.2
v2.0.0-rc.1
v2.0.0-rc.11
v2.0.0-rc.12
v2.0.0-rc.13
v2.0.0-rc.2
v2.0.0-rc.3
v2.0.0-rc.4
v2.0.0-rc.5
v2.0.0-rc.6
v2.0.0-rc.7
v2.0.0-rc.8
v2.0.1
v2.0.10
v2.0.11
v2.0.12
v2.0.13
v2.0.14
v2.0.15
v2.0.16
v2.0.17
v2.0.18
v2.0.19
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9
v2.1.0
v2.1.1
v2.1.10
v2.1.11
v2.1.12
v2.1.2
v2.1.3
v2.1.4
v2.1.5
v2.1.6
v2.1.7
v2.1.8
v2.1.9
v3.*
v3.0.0-beta.1
v3.0.0-beta.10
v3.0.0-beta.11
v3.0.0-beta.12
v3.0.0-beta.2
v3.0.0-beta.3
v3.0.0-beta.4
v3.0.0-beta.5
v3.0.0-beta.6
v3.0.0-beta.7
v3.0.0-beta.8
v3.0.0-beta.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39315.json"