Vulnerability in Svelte Sveltekit
CVE-2026-82258
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/sveltejs/kit/security/advisories/GHSA-hgv7-v322-mmgr (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/sveltekit-2.38.0-before-2.60.1-cross-user-data-dis… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-82258?
- CVE-2026-82258 is a medium-severity vulnerability in Svelte Sveltekit, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.8/10. Published 2026-08-28.
- How severe is CVE-2026-82258?
- Medium severity. CVSS v3 base score is 4.8 out of 10.