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Vulnerabilities

Security fix · CVE-2026-71321

Unauthenticated CPU exhaustion parsing and hashing the Nuxt island endpoint body before hash validation

Published Jul 27, 2026 · catalog updated Aug 5, 2026 · Unauthenticated CPU exhaustion parsing

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-71321. EPSS is 0.74%. Act only if a listed version of Unauthenticated CPU exhaustion parsing is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Unauthenticated CPU exhaustion parsing).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.74%
Remediation
Version ranges on file
Affected products
npm nuxt

### Impact The internal island renderer endpoint ( ) decodes and hashes attacker-controlled request input before it validates the URL-resident hash. An unauthenticated with a large JSON body (for example ~4.6 MB / 150k keys) is fully read, -parsed, and run through before the request is rejected with a 400. Because Nitro runs on a single event loop, this both wastes CPU on the doomed request and delays every concurrent request. A low request rate is enough to degrade or stall the server. No valid hash and no authentication are required. ### Patches Fixed in and . The island handler now enforces a raw body-size cap ( ) and a JSON nesting-depth cap ( ) before parsing or hashing, so oversized or deeply nested input is rejected cheaply. ### Workarounds Put a small request-body limit in front of at your reverse proxy / edge (islands legitimately send only a compact props payload), or disable server components if unused. ### References - Handler: - Guard:

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm nuxt>= 3.1.0, < 3.21.10
  • npm nuxt>= 4.0.0, < 4.5.1

How to fix CVE-2026-71321

  • Upgrade

    CVE-2026-71321 lists a fix boundary at 3.21.10. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 3.21.10

  • Advisory

    Open the inventory_github record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-71321. EPSS is 0.74%. Act only if a listed version of Unauthenticated CPU exhaustion parsing is installed.

Which versions are affected?

Compare what you have installed with >= 3.1.0, < 3.21.10, >= 4.0.0, < 4.5.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-407; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.74%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Nuxt security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 27, 2026 · Maintainer security tabs

    Detected

    ### Impact The internal island renderer endpoint ( ) decodes and hashes attacker-controlled request input before it validates the URL-resident hash. An unauthenticated with a large JSON body (for example ~4.6 MB / 150k keys) is fully read, -parsed, and run through before the request is rejected with a 400. Because Nitro runs on a single event loop, this both wastes CPU on the doomed request and de

  2. Aug 5, 2026 · Maintainer security tabs

    Updated

    ### Impact The internal island renderer endpoint ( ) decodes and hashes attacker-controlled request input before it validates the URL-resident hash. An unauthenticated with a large JSON body (for example ~4.6 MB / 150k keys) is fully read, -parsed, and run through before the request is rejected with a 400. Because Nitro runs on a single event loop, this both wastes CPU on the doomed request and de

Sources

  • Maintainer security tabsVendor advisoryGHSA-9pgf-384g-p7mv

    ### Impact The internal island renderer endpoint ( ) decodes and hashes attacker-controlled request input before it validates the URL-resident hash. An unauthenticated with a large JSON body (for example ~4.6 MB / 150k keys) is fully read, -parsed, and run through before the request is rejected with a 400. Because Nitro runs on a single event loop, this both wastes CPU on the doomed request and de

    github.com

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Maintainer security tabsNov 2, 2026