CVE-2026-128123

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-128123", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-12T22:42:47.031Z", "datePublished": "2026-11-13T19:54:05.381Z", "dateUpdated": "2026-11-13T19:54:05.381Z"}, "containers": {"cna": {"title": "SvelteKit: `@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`", "problemTypes": [{"descriptions": [{"cweId": "CWE-248", "lang": "en", "description": "CWE-248: Uncaught Exception", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p"}, {"name": "https://github.com/sveltejs/kit/pull/17620", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/pull/17620"}, {"name": "https://github.com/sveltejs/kit/commit/04756a1f7a4f73e34f1934895340a46de84fc164", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/commit/04756a1f7a4f73e34f1934895340a46de84fc164"}, {"name": "https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"}, {"name": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@5.5.8", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@5.5.8"}, {"name": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@6.0.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@6.0.1"}], "affected": [{"vendor": "sveltejs", "product": "kit", "versions": [{"version": ">= 3.0.0-next.0, < 3.1.1", "status": "affected"}, {"version": "< 2.70.4", "status": "affected"}]}, {"vendor": "@sveltejs", "product": "adapter-node", "versions": [{"version": ">= 5.5.7, < 5.5.8", "status": "affected"}, {"version": ">= 6.0.0-next.0, < 6.0.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-13T19:54:05.381Z"}, "descriptions": [{"lang": "en", "value": "SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 5.5.7 until versions 5.5.8 and 6.0.1, , @sveltejs/adapter-node can attempt to add a header to an immutable request in a context that causes the server to crash, denying service to any other requests routed to that server. This issue is fixed in 5.5.8 and 6.0.1."}], "source": {"advisory": "GHSA-rqw3-x7hx-mm3p", "discovery": "UNKNOWN"}}}}

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{"affected": [{"affectedData": [{"product": "kit", "vendor": "sveltejs", "versions": [{"status": "affected", "version": ">= 3.0.0-next.0, < 3.1.1"}, {"status": "affected", "version": "< 2.70.4"}]}, {"product": "adapter-node", "vendor": "@sveltejs", "versions": [{"status": "affected", "version": ">= 5.5.7, < 5.5.8"}, {"status": "affected", "version": ">= 6.0.0-next.0, < 6.0.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 5.5.7 until versions 5.5.8 and 6.0.1, , @sveltejs/adapter-node can attempt to add a header to an immutable request in a context that causes the server to crash, denying service to any other requests routed to that server. This issue is fixed in 5.5.8 and 6.0.1."}], "id": "CVE-2026-128123", "lastModified": "2026-11-13T20:18:57.300", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-13T20:18:57.300", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/commit/04756a1f7a4f73e34f1934895340a46de84fc164"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/pull/17620"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@5.5.8"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@6.0.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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