# Svelte vulnerabilities Source: https://junglewise.ai/threats/vendors/svelte Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/svelte.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 30 vulnerabilities in Svelte: 1 in the last 7 days and 19 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-123563, was published on 8 November 2026. 6 vulnerabilities in the last four weeks, down 14% on the four before (7). 3 technologies have a page of their own. ## Counts - Last 7 days: 1 - Last 30 days: 6 - Last 90 days: 19 - All time: 30 (0 critical, 0 exploited in the wild) ## About Svelte Svelte is a community-driven project that provides tools for building user interfaces. ## Latest Svelte vulnerabilities - [CVE-2026-123563: Devalue validation bypass in ArrayBuffer reviver](https://junglewise.ai/threats/cve-2026-123563-devalue-before-5-9-3-contains-a-validation-bypass-vulnerability) (high, CVSS 7.5, published 8 Nov 2026) - [SvelteKit open redirect in enhanced form actions](https://junglewise.ai/threats/duplicate-advisory-sveltekit-before-3-0-0-open-redirect-via-enhanced-9a8dcd94) (medium, CVSS 4.7, published 21 Oct 2026) - [SvelteKit XSS via cache-control header in prerendered pages](https://junglewise.ai/threats/duplicate-advisory-sveltekit-before-3-0-0-xss-via-cache-control-header-5731f4e1) (medium, CVSS 4.7, published 21 Oct 2026) - [CVE-2026-114063: SvelteKit path traversal in vite preview server on Windows](https://junglewise.ai/threats/cve-2026-114063-sveltekit-sveltejs-kit-from-2-10-0-before-3-0-0-contains-a-path) (high, CVSS 7.5, published 21 Oct 2026) - [CVE-2026-114062: SvelteKit server-side request forgery in self-fetch fallbacks](https://junglewise.ai/threats/cve-2026-114062-sveltekit-before-3-0-0-contains-a-server-side-request-forgery) (medium, CVSS 5.3, published 21 Oct 2026) - [CVE-2026-114061: SvelteKit cross-site scripting in prerendered pages](https://junglewise.ai/threats/cve-2026-114061-sveltekit-sveltejs-kit-before-3-0-0-contains-a-cross-site) (medium, CVSS 4.7, published 21 Oct 2026) - [devalue uneval sparse-array CPU amplification](https://junglewise.ai/threats/devalue-residual-sparse-array-cpu-amplification-in-uneval-288a909c) (medium, CVSS 4, published 1 Oct 2026) - [devalue quadratic expansion in uneval with repeated primitives](https://junglewise.ai/threats/devalue-repeated-primitive-strings-cause-quadratic-expansion-in-uneval-9363872e) (medium, CVSS 4, published 1 Oct 2026) - [devalue sparse arrays excessive memory allocation in uneval](https://junglewise.ai/threats/devalue-sparse-arrays-emitted-by-uneval-cause-eager-allocation-when-79528840) (medium, CVSS 4, published 1 Oct 2026) - [devalue ArrayBuffer allocation bypass via custom reviver](https://junglewise.ai/threats/devalue-custom-arraybuffer-revivers-can-bypass-typed-array-allocation-ecd9322f) (high, CVSS 4, published 1 Oct 2026) - [devalue stringifyAsync unhandled promise rejection](https://junglewise.ai/threats/devalue-stringifyasync-can-cause-an-unhandled-rejection-despite-a-1b814ff8) (medium, CVSS 4, published 1 Oct 2026) - [devalue library __proto__ bypass via malformed null-prototype keys](https://junglewise.ai/threats/devalue-malformed-null-prototype-object-keys-bypass-proto-rejection-via-aefa93ff) (medium, CVSS 4, published 1 Oct 2026) - [CVE-2026-92708: Svelte devalue memory disclosure in Node Buffer serialization](https://junglewise.ai/threats/cve-2026-92708-svelte-devalue-is-a-javascript-library-that-serializes-values) (high, CVSS 7.5, published 18 Sep 2026) - [CVE-2026-82261: SvelteKit CPU exhaustion in remote form deserialization](https://junglewise.ai/threats/cve-2026-82261-sveltekit-cpu-exhaustion-in-remote-form-deserialization) (high, CVSS 7.5, published 28 Aug 2026) - [CVE-2026-82260: SvelteKit memory exhaustion in remote form deserialization](https://junglewise.ai/threats/cve-2026-82260-sveltekit-memory-exhaustion-in-remote-form-deserialization) (high, CVSS 7.5, published 28 Aug 2026) - [CVE-2026-82259: SvelteKit deserialization expansion in form remote function](https://junglewise.ai/threats/cve-2026-82259-sveltekit-deserialization-expansion-in-form-remote-function) (high, CVSS 7.5, published 28 Aug 2026) - [CVE-2026-82258: SvelteJS Kit query.batch cross-talk vulnerability](https://junglewise.ai/threats/cve-2026-82258-sveltejs-kit-query-batch-cross-talk-vulnerability) (medium, CVSS 4.8, published 28 Aug 2026) - [CVE-2026-82257: SvelteKit prototype pollution in file input deletion](https://junglewise.ai/threats/cve-2026-82257-sveltekit-prototype-pollution-in-file-input-deletion) (medium, CVSS 4.3, published 28 Aug 2026) - [CVE-2026-82256: SvelteKit unhandled promise rejection in form payload handling](https://junglewise.ai/threats/cve-2026-82256-sveltekit-unhandled-promise-rejection-in-form-payload-handling) (medium, CVSS 5.3, published 28 Aug 2026) - [CVE-2026-66062: Svelte SvelteKit ReDoS in Accept header content negotiation](https://junglewise.ai/threats/cve-2026-66062-svelte-sveltekit-redos-in-accept-header-content-negotiation) (medium, CVSS 5.3, published 7 Aug 2026) - [CVE-2026-40074: Svelte SvelteKit denial of service in redirect function](https://junglewise.ai/threats/cve-2026-40074-svelte-sveltekit-denial-of-service-in-redirect-function) (high, CVSS 7.5, published 10 Apr 2026) - [CVE-2026-40073: Svelte SvelteKit body size limit bypass in adapter-node](https://junglewise.ai/threats/cve-2026-40073-svelte-sveltekit-body-size-limit-bypass-in-adapter-node) (high, CVSS 7.5, published 10 Apr 2026) - [CVE-2026-27118: Svelte adapter-vercel cache poisoning via ISR query parameter](https://junglewise.ai/threats/cve-2026-27118-svelte-adapter-vercel-cache-poisoning-via-isr-query-parameter) (medium, CVSS 4, published 19 Feb 2026) - [CVE-2026-22803: SvelteKit memory amplification DoS in form deserializer](https://junglewise.ai/threats/cve-2026-22803-sveltekit-memory-amplification-dos-in-form-deserializer) (medium, CVSS 4, published 15 Jan 2026) - [CVE-2025-67647: SvelteKit denial of service and SSRF in prerendering](https://junglewise.ai/threats/cve-2025-67647-sveltekit-denial-of-service-and-ssrf-in-prerendering) (medium, CVSS 4, published 15 Jan 2026) ## Most severe Svelte vulnerabilities - [CVE-2023-29003: SvelteKit vulnerable to Cross-Site Request Forgery](https://junglewise.ai/threats/cve-2023-29003-sveltekit-insufficient-cross-site-request-forgery-protection) (high, CVSS 8.8, published 4 Apr 2023) - [CVE-2023-29008: SvelteKit framework has Insufficient CSRF protection for CORS requests](https://junglewise.ai/threats/cve-2023-29008-sveltekit-insufficient-csrf-protection-in-cors-requests) (high, CVSS 8.8, published 7 Apr 2023) - [CVE-2026-40073: Svelte SvelteKit body size limit bypass in adapter-node](https://junglewise.ai/threats/cve-2026-40073-svelte-sveltekit-body-size-limit-bypass-in-adapter-node) (high, CVSS 7.5, published 10 Apr 2026) - [CVE-2024-23641: Sending a GET or HEAD request with a body crashes SvelteKit](https://junglewise.ai/threats/cve-2024-23641-sveltekit-denial-of-service-via-get-head-requests-with-body) (high, CVSS 7.5, published 24 Jan 2024) - [CVE-2026-92708: Svelte devalue memory disclosure in Node Buffer serialization](https://junglewise.ai/threats/cve-2026-92708-svelte-devalue-is-a-javascript-library-that-serializes-values) (high, CVSS 7.5, published 18 Sep 2026) - [CVE-2026-40074: Svelte SvelteKit denial of service in redirect function](https://junglewise.ai/threats/cve-2026-40074-svelte-sveltekit-denial-of-service-in-redirect-function) (high, CVSS 7.5, published 10 Apr 2026) - [CVE-2026-82259: SvelteKit deserialization expansion in form remote function](https://junglewise.ai/threats/cve-2026-82259-sveltekit-deserialization-expansion-in-form-remote-function) (high, CVSS 7.5, published 28 Aug 2026) - [CVE-2026-82261: SvelteKit CPU exhaustion in remote form deserialization](https://junglewise.ai/threats/cve-2026-82261-sveltekit-cpu-exhaustion-in-remote-form-deserialization) (high, CVSS 7.5, published 28 Aug 2026) - [CVE-2026-82260: SvelteKit memory exhaustion in remote form deserialization](https://junglewise.ai/threats/cve-2026-82260-sveltekit-memory-exhaustion-in-remote-form-deserialization) (high, CVSS 7.5, published 28 Aug 2026) - [CVE-2026-123563: Devalue validation bypass in ArrayBuffer reviver](https://junglewise.ai/threats/cve-2026-123563-devalue-before-5-9-3-contains-a-validation-bypass-vulnerability) (high, CVSS 7.5, published 8 Nov 2026) ## Vulnerabilities per week 6 vulnerabilities in the last four weeks, down 14% on the four before (7). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 6 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 1 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 6 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 5 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 1 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Svelte technologies - [SvelteKit](https://junglewise.ai/threats/technologies/sveltekit): 20 vulnerabilities - [Svelte Devalue](https://junglewise.ai/threats/technologies/svelte-devalue): 8 vulnerabilities - [Svelte Kit](https://junglewise.ai/threats/technologies/kit): 5 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Svelte vulnerabilities", https://junglewise.ai/threats/vendors/svelte, 9 November 2026.