CVE-2026-82258: SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-10-08
Weakness: CWE-362

Description

SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge under a single request context. Attackers can exploit specific timing conditions to access sensitive data from other users' concurrent requests.

Affected products

sveltejs kit: from 2.38.0 before 2.60.1 — fixed in 2.60.1

How to fix

Upgrade to a fixed version: sveltejs kit 2.60.1. Check the vendor advisory for mitigations.

References

https://github.com/sveltejs/kit/security/advisories/GHSA-hgv7-v322-mmgr
https://www.vulncheck.com/advisories/sveltekit-2.38.0-before-2.60.1-cross-user-data-disclosure-via-query-batch

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