CVE-2026-39315: Unhead is a document head and template manager

Routine

MEDIUM 6.1UPGRADE

CVE-2026-39315 is a medium-severity flaw (CVSS 6.1) affecting unhead. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 c

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-184
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: unjs

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 18:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

unjs unhead UPGRADE

Affected: < 2.1.13

Fixed in: 2.1.13

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls unhead

2. UPGRADE to 2.1.13

npm install unhead@">=2.1.13"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39315?

unhead: upgrade to 2.1.13. Exact commands for each OS are on this page.

Is CVE-2026-39315 being exploited?

CVE-2026-39315 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39315 affect?

CVE-2026-39315 affects unhead. Severity is medium (CVSS 6.1). 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(

How urgent is CVE-2026-39315?

Priority 32/100. Public exploit reference

References

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