Server-Side Request Forgery in SvelteKit Affects Internal Services
CVE-2026-114062

6.9MEDIUM

Key Information:

Vendor

Sveltejs

Status
Kit
Vendor
CVE Published:
21 October 2026

What is CVE-2026-114062?

SvelteKit prior to 3.0.0 is susceptible to a server-side request forgery (SSRF) vulnerability. This flaw enables remote attackers to exploit improperly handled HTTP redirects during server-side self-fetching operations. By manipulating the Host or forwarded headers, adversaries can redirect fallback requests to their server, allowing unauthorized access to internal services that should remain protected.

Affected Version(s)

kit 0 < 3.0.0

kit 3.0.0

References

https://github.com/sveltejs/kit/security/advisories/GHSA-...
vendor-advisory
https://www.vulncheck.com/advisories/sveltekit-before-3.0...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Rich-Harris
.