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SvelteKit is vulnerable to remote CPU-exhaustion DoS attacks via specifically-crafted Accept headers. The impact is mitigated by default header length limits on most platforms, but in the case of raised or absent limits a denial of service is possible.
Patches
The vulnerability is patched in @sveltejs/kit version 2.70.2.
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dependenciesAnything related to dependency issues or updates.
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This PR contains the following updates:
2.70.1→2.70.2SvelteKit: ReDoS (O(n^2)) in content negotiation — unauthenticated DoS via the Accept header
CVE-2026-66062 / GHSA-29g2-3rmr-qm68
More information
Details
Impact
SvelteKit is vulnerable to remote CPU-exhaustion DoS attacks via specifically-crafted
Acceptheaders. The impact is mitigated by default header length limits on most platforms, but in the case of raised or absent limits a denial of service is possible.Patches
The vulnerability is patched in
@sveltejs/kitversion 2.70.2.Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
sveltejs/kit (@sveltejs/kit)
v2.70.2Compare Source
Patch Changes
Acceptheader content negotiation (#1)Configuration
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