{"id":"CVE-2026-82261","aliases":["EUVD-2026-67587","GHSA-88qp-p4qg-rqm6","GHSA-xjpx-7387-jh7h"],"status":"published","title":"SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization","description":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00493,"percentile":0.42869,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-843"],"published":"2026-02-19T20:30:25Z","modified":"2026-10-28T02:30:32Z","fixes":[{"ecosystem":"npm","package":"@sveltejs/kit","fixed_in":["2.52.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@sveltejs/kit","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.49.0"},{"last_affected":"2.52.1"},{"fixed":"2.52.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@sveltejs/kit","ranges":[{"type":"SEMVER","events":[{"introduced":"2.49.0"},{"fixed":"2.52.2"}]}]}],"products":[{"vendor":"svelte","product":"sveltekit"},{"vendor":"sveltejs","product":"kit"}],"references":[{"url":"https://github.com/sveltejs/kit/security/advisories/GHSA-88qp-p4qg-rqm6","tags":["vendor-advisory","Vendor Advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/sveltekit-before-2.52.2-cpu-exhaustion-via-remote-form-deserialization","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://github.com/sveltejs/kit/commit/3e607b314aec9e5f278d32847945b8b6323e1cb8","tags":["web"]},{"url":"https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.52.2","tags":["web"]},{"url":"https://github.com/advisories/GHSA-88qp-p4qg-rqm6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82261","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xjpx-7387-jh7h"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82261.json","tags":["advisory"]},{"url":"https://github.com/sveltejs/kit","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-82261","title":"SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization","description":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.","status":"published","published":"2026-08-28T10:49:44.323Z","modified":"2026-10-08T15:25:32.042Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T13:40:46.161838Z"}],"euvd":[{"id":"EUVD-2026-67587","description":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.","status":"published","published":"2026-08-28T10:49:44Z","modified":"2026-10-08T15:25:32Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:28.564399Z"}],"ghsa":[{"id":"GHSA-88qp-p4qg-rqm6","title":"CPU exhaustion in SvelteKit remote form deserialization (experimental only)","description":"Versions of `@sveltejs/kit` prior to 2.52.2 with remote functions enabled are vulnerable to CPU exhaustion. Malformed form data can cause the server to become unresponsive while processing a request, resulting in denial of service.\n\nOnly applications using both `experimental.remoteFunctions` and `form` are vulnerable.","status":"published","published":"2026-02-19T20:30:25Z","modified":"2026-02-19T20:30:29Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T14:39:25.82905Z"},{"id":"GHSA-xjpx-7387-jh7h","title":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and...","description":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.","status":"published","published":"2026-08-28T12:30:29Z","modified":"2026-08-28T12:30:36Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:11:06.970333Z"}],"nvd":[{"id":"CVE-2026-82261","description":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.","status":"published","published":"2026-08-28T12:16:39.25Z","modified":"2026-10-08T16:17:48.98Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:12:42.366888Z"}],"osv":[{"id":"CVE-2026-82261","title":"SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization","description":"SvelteKit (@sveltejs/kit) versions \u003e=2.49.0 and \u003c=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.","status":"published","published":"2026-08-28T10:49:44.323Z","modified":"2026-10-28T02:30:32.357370724Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:45:18.131258Z"},{"id":"GHSA-88qp-p4qg-rqm6","title":"CPU exhaustion in SvelteKit remote form deserialization (experimental only)","description":"Versions of `@sveltejs/kit` prior to 2.52.2 with remote functions enabled are vulnerable to CPU exhaustion. Malformed form data can cause the server to become unresponsive while processing a request, resulting in denial of service.\n\nOnly applications using both `experimental.remoteFunctions` and `form` are vulnerable.","status":"published","published":"2026-02-19T20:30:25Z","modified":"2026-09-02T03:55:41.454707662Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T15:46:42.077781Z"}]}}