CVE-2025-67647Network attack vector

Server crash and SSRF via prerender rerouting

Published Jan 15, 2026 · Updated Jan 15, 2026

SSRF and denial of service in SvelteKit 2.19.0 through 2.49.4 allow remote attackers to access internal services or terminate servers. The prerender reroute path compares a decoded resolved path with an encoded URL pathname, then fetches a URL whose origin can derive from unvalidated request headers. Exploitation requires a prerendered route; SSRF also requires adapter-node without ORIGIN or a validating reverse proxy, while versions 2.44.0 through 2.49.4 can crash with prerendering alone.

CVSS severity8.4
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF and denial of service in SvelteKit 2.19.0 through 2.49.4 allow remote attackers to access internal services or terminate servers. The prerender reroute path compares a decoded resolved path with an encoded URL pathname, then fetches a URL whose origin can derive from unvalidated request headers. Exploitation requires a prerendered route; SSRF also requires adapter-node without ORIGIN or a validating reverse proxy, while versions 2.44.0 through 2.49.4 can crash with prerendering alone.

The record

CVE
CVE-2025-67647
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Svelte
Product
SvelteKit
Classifications
CWE-400, CWE-918, CWE-248, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.19.0, < 2.49.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Svelte · SvelteKitversion=>= 2.19.0, < 2.49.5

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
8.4GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-918Server-Side Request Forgery (SSRF)
CWE-248Uncaught Exception
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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