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CVE-2025-67647: SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte

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CRITICAL 9.1REMOTEUPGRADEUPGRADE

CVE-2025-67647 is a critical-severity flaw (CVSS 9.1) affecting adapter-node, kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.44.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route (export const prerender = true). From 2.19.0 through 2.49.4, the vulnerability results in a DoS when your

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.1 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 56%)
CISA exploited listNo
WeaknessCWE-248, CWE-918
Published2026-01-15
Last modified2026-06-17
Publisher (CNA): GitHub, Inc. · Vendor: svelte

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

svelte adapter-node UPGRADE
Affected: >= 5.4.1 and < 5.5.1
Fixed in: 5.5.1
Safe to downgrade to: a release before 5.4.1
1. Check installed version
npm ls adapter-node
2. UPGRADE to 5.5.1
npm install adapter-node@">=5.5.1"
3. If no update is available yet, DOWNGRADE to a release before 5.4.1
npm view adapter-node versions npm install adapter-node@"<5.4.1"
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
svelte kit UPGRADE
Affected: >= 2.19.0 and < 2.49.5
Fixed in: 2.49.5
Safe to downgrade to: a release before 2.19.0
1. Check installed version
npm ls kit
2. UPGRADE to 2.49.5
npm install kit@">=2.49.5"
3. If no update is available yet, DOWNGRADE to a release before 2.19.0
npm view kit versions npm install kit@"<2.19.0"
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
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-2025-67647?

adapter-node: upgrade to 5.5.1; kit: upgrade to 2.49.5. Exact commands for each OS are on this page.

Is CVE-2025-67647 being exploited?

CVE-2025-67647 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-2025-67647 affect?

CVE-2025-67647 affects adapter-node, kit. Severity is critical (CVSS 9.1). SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.

How urgent is CVE-2025-67647?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

References

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