{"answers":{"affected":"2 open source packages ship an affected version, including @sveltejs/kit. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-82259 in the wild and no public exploit code.","fix":"Upgrade @sveltejs/kit to 2.53.3 or later.","what":"CVE-2026-82259 is a high-severity denial of service vulnerability in sveltejs kit, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-82259 and fix it if it is affected.\n\nWhat it is: CVE-2026-82259 is a high-severity denial of service vulnerability in sveltejs kit, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-82259 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @sveltejs/kit (npm): affected from 2.49.0; fixed in 2.53.3\n- @sveltejs/kit (npm): affected from 2.49.0; fixed in 2.53.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-82259/ (Markdown: https://insights.sbomify.com/CVE-2026-82259/index.md)","id":"CVE-2026-82259","markdown":"https://insights.sbomify.com/CVE-2026-82259/index.md","name":"CVE-2026-82259","record":{"aliases":["GHSA-7jhg-723h-fjhx","GHSA-fpg4-jhqr-589c"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"SvelteKit framework","requires_auth":"none","summary":"Attackers can cause denial of service in SvelteKit applications by exploiting deserialization expansion in experimental remote form functions.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"sveltekit","vendor":"svelte"}],"cvss":{"score":8.7,"severity":"high","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"SvelteKit 2.49.0 before 2.53.3 Denial of Service via form","id":"CVE-2026-82259","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"SvelteKit before 2.52.2 Memory Exhaustion via Remote Form Deserialization","id":"CVE-2026-82260"},"packages":[{"ecosystem":"npm","fixed":["2.53.3"],"introduced":["2.49.0"],"last_affected":[],"package":"@sveltejs/kit","purl":null,"source":"GHSA-fpg4-jhqr-589c"},{"ecosystem":"npm","fixed":["2.53.3"],"introduced":["2.49.0"],"last_affected":[],"package":"@sveltejs/kit","purl":"pkg:npm/%40sveltejs/kit","source":"GHSA-fpg4-jhqr-589c"}],"prev":{"headline":"SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch","id":"CVE-2026-82258"},"products":["kit"],"published":"2026-08-28","related":[{"cvss_score":8.8,"headline":"SvelteKit framework has Insufficient CSRF protection for CORS requests","id":"CVE-2023-29008","kev_date_added":null,"published":"2023-04-06"},{"cvss_score":8.8,"headline":"SvelteKit has Insufficient Cross-Site Request Forgery Protection","id":"CVE-2023-29003","kev_date_added":null,"published":"2023-04-04"},{"cvss_score":8.7,"headline":"SvelteKit before 2.52.2 Memory Exhaustion via Remote Form Deserialization","id":"CVE-2026-82260","kev_date_added":null,"published":"2026-08-28"},{"cvss_score":8.7,"headline":"SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization","id":"CVE-2026-82261","kev_date_added":null,"published":"2026-08-28"},{"cvss_score":6.9,"headline":"SvelteKit before 2.69.1 Denial of Service via Remote Form","id":"CVE-2026-82256","kev_date_added":null,"published":"2026-08-28"},{"cvss_score":5.9,"headline":"SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch","id":"CVE-2026-82258","kev_date_added":null,"published":"2026-08-28"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["sveltejs"]},"summary":"Attackers can cause denial of service in SvelteKit applications by exploiting deserialization expansion in experimental remote form functions.","url":"https://insights.sbomify.com/CVE-2026-82259/"}