CVE-2026-114062: SvelteKit before 3.0.0 SSRF via Redirects in Server-Side Self-Fetch Fallbacks

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-21 · updated 2026-10-22
Weakness: CWE-918

Description

SvelteKit before 3.0.0 contains a server-side request forgery vulnerability that allows remote attackers to reach internal services because self-fetch fallbacks follow HTTP redirects automatically. Attackers can manipulate the Host or forwarded headers to point fallback requests at their server, which redirects them to internal services.

Affected products

sveltejs kit: before 3.0.0 — fixed in 3.0.0

How to fix

Upgrade to a fixed version: sveltejs kit 3.0.0. Check the vendor advisory for mitigations.

References

https://github.com/sveltejs/kit/security/advisories/GHSA-prjg-x2qj-wj3g
https://www.vulncheck.com/advisories/sveltekit-before-3.0.0-ssrf-via-redirects-in-server-side-self-fetch-fallbacks

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