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

Quick assessment

Affected
sveltejs kit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SvelteKit 从 2.38.0 到 2.60.1 之前的版本中， 存在一个竞态条件（race condition），使得来自不同用户的并发请求可能会在同一个请求上下文中合并。攻击者可以利用特定的时序条件，访问其他用户并发请求中的敏感数据。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-82258

Vulnerability Information
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Vulnerability Title
SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sveltejs kit 2.38.0 ~ 2.60.1 -

II. Public POCs for CVE-2026-82258

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-82258

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Vendor Advisories for CVE-2026-82258 (2)

Same Patch Batch · sveltejs · 2026-08-28 · 6 CVEs total

CVE-2026-82259 7.5 HIGH SvelteKit 2.49.0 before 2.53.3 Denial of Service via form
CVE-2026-82260 7.5 HIGH SvelteKit before 2.52.2 Memory Exhaustion via Remote Form Deserialization
CVE-2026-82261 7.5 HIGH SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization
CVE-2026-82256 5.3 MEDIUM SvelteKit before 2.69.1 Denial of Service via Remote Form
CVE-2026-82257 4.3 MEDIUM SvelteKit before 2.69.1 Prototype Pollution via File Input

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-362

V. Comments for CVE-2026-82258

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