CVE-2026-40074— SvelteKit's invalidated redirect in handle hook causes Denial-of-Service
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是Svelte开源的一套Web 开发框架。 SvelteKit 2.57.1之前版本存在安全漏洞，该漏洞源于handle服务器钩子中redirect函数处理不当，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1498 · Network Denial of Service
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-40074
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
SvelteKit's invalidated redirect in handle hook causes Denial-of-Service
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in a HTTP header, will cause an unhandled TypeError. This could result in DoS on some platforms, especially if the location passed to redirect contains unsanitized user input. This vulnerability is fixed in 2.57.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
SvelteKit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 2.57.1之前版本存在安全漏洞，该漏洞源于handle服务器钩子中redirect函数处理不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-40074
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-40074
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-40074 (1)
-
Merge commit from fork · sveltejs/kit@10d7b44 · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-40074 (1)
Vendor Pages for CVE-2026-40074 (1)
-
Release @sveltejs/kit@2.57.1 · sveltejs/kit · GitHub x_refsource_MISC
IV. Related Vulnerabilities
Same product: kit
-
CVE-2026-82260
SvelteKit before 2.52.2 Memory Exhaustion via Remote Form De -
CVE-2026-82261
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deser -
CVE-2026-82259
SvelteKit 2.49.0 before 2.53.3 Denial of Service via form -
CVE-2026-82258
SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure vi -
CVE-2026-82257
SvelteKit before 2.69.1 Prototype Pollution via File Input
Same vendor: sveltejs
-
CVE-2026-92708
devalue: Cross-request process memory disclosure in devalue -
CVE-2026-81176
Svelte devalue: DoS via malformed input -
CVE-2026-82261
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deser -
CVE-2026-82260
SvelteKit before 2.52.2 Memory Exhaustion via Remote Form De -
CVE-2026-82259
SvelteKit 2.49.0 before 2.53.3 Denial of Service via form
Same weakness: CWE-755
-
CVE-2026-102274
PyJWT: Malformed RSA JWK aborts parsing of an entire JWK Set -
CVE-2026-101099
ag-ui-protocol ag-ui Kotlin Community SDK SseParser.kt excep -
CVE-2026-101017
Trusted Domain Project OpenDMARC opendmarc_policy.c strcasec -
CVE-2026-101016
Trusted Domain Project OpenDMARC opendmarc_policy.c opendmar -
CVE-2026-63450
Suricata ftp: RETR/STOR before PORT/PASV can disable further
V. Comments for CVE-2026-40074
No comments yet