CVE-2026-128122

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-128122", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-12T22:42:47.031Z", "datePublished": "2026-11-13T19:47:28.720Z", "dateUpdated": "2026-11-13T19:47:28.720Z"}, "containers": {"cna": {"title": "SvelteKit: Prerendered redirect paths can inject arbitrary rules into the `_redirects` file generated by `@sveltejs/adapter-cloudflare`", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-93", "lang": "en", "description": "CWE-93: Improper Neutralization of CRLF Sequences", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-116", "lang": "en", "description": "CWE-116: Improper Encoding or Escaping of Output", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/sveltejs/kit/security/advisories/GHSA-5wg4-q3ww-283h", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-5wg4-q3ww-283h"}, {"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/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"}, {"name": "https://github.com/sveltejs/kit/commit/679e0d84ea9951bb4f1e458a599066b5a451b08a", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/commit/679e0d84ea9951bb4f1e458a599066b5a451b08a"}, {"name": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-cloudflare@7.2.10", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-cloudflare@7.2.10"}, {"name": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-cloudflare@8.0.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-cloudflare@8.0.2"}], "affected": [{"vendor": "sveltejs", "product": "kit", "versions": [{"version": ">= 4.7.0, < 7.2.10", "status": "affected"}, {"version": ">= 8.0.0-next.0, < 8.0.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-13T19:47:28.720Z"}, "descriptions": [{"lang": "en", "value": "SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 4.7.0 until versions 7.2.10 and 8.0.2, @sveltejs/adapter-cloudflare allowed an attacker-influenced link crawled during prerendering to place whitespace, control characters, wildcards, or placeholders into a prerendered redirect path. The adapter wrote those paths into the Cloudflare _redirects output without output-context validation, allowing a path to create unintended routing rules that could redirect or expose requests beyond the intended prerendered route. This issue is fixed in 7.2.10 and 8.0.2."}], "source": {"advisory": "GHSA-5wg4-q3ww-283h", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "kit", "vendor": "sveltejs", "versions": [{"status": "affected", "version": ">= 4.7.0, < 7.2.10"}, {"status": "affected", "version": ">= 8.0.0-next.0, < 8.0.2"}]}], "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 4.7.0 until versions 7.2.10 and 8.0.2, @sveltejs/adapter-cloudflare allowed an attacker-influenced link crawled during prerendering to place whitespace, control characters, wildcards, or placeholders into a prerendered redirect path. The adapter wrote those paths into the Cloudflare _redirects output without output-context validation, allowing a path to create unintended routing rules that could redirect or expose requests beyond the intended prerendered route. This issue is fixed in 7.2.10 and 8.0.2."}], "id": "CVE-2026-128122", "lastModified": "2026-11-13T20:18:57.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-13T20:18:57.147", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/commit/679e0d84ea9951bb4f1e458a599066b5a451b08a"}, {"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-cloudflare@7.2.10"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-cloudflare@8.0.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-5wg4-q3ww-283h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-93"}, {"lang": "en", "value": "CWE-116"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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