{"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-2026-82257 in the wild and no public exploit code.","fix":"Upgrade @sveltejs/kit to 2.69.1 or later.","what":"CVE-2026-82257 is a medium-severity vulnerability in sveltejs kit, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-82257 and fix it if it is affected.\n\nWhat it is: CVE-2026-82257 is a medium-severity vulnerability in sveltejs kit, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-82257 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @sveltejs/kit (npm): affected all versions; fixed in 2.69.1\n- @sveltejs/kit (npm): affected all versions; fixed in 2.69.1\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-2026-82257/ (Markdown: https://insights.sbomify.com/CVE-2026-82257/index.md)","id":"CVE-2026-82257","markdown":"https://insights.sbomify.com/CVE-2026-82257/index.md","name":"CVE-2026-82257","record":{"aliases":["GHSA-6mgf-42wv-8j7p","GHSA-866w-xmhq-wj7x"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"SvelteKit framework","requires_auth":"none","summary":"Attackers can cause denial of service in SvelteKit applications by exploiting prototype pollution in remote form file inputs.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"sveltekit","vendor":"svelte"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.","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 before 2.69.1 Prototype Pollution via File Input","id":"CVE-2026-82257","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch","id":"CVE-2026-82258"},"packages":[{"ecosystem":"npm","fixed":["2.69.1"],"introduced":["0"],"last_affected":[],"package":"@sveltejs/kit","purl":null,"source":"GHSA-866w-xmhq-wj7x"},{"ecosystem":"npm","fixed":["2.69.1"],"introduced":["0"],"last_affected":[],"package":"@sveltejs/kit","purl":"pkg:npm/%40sveltejs/kit","source":"GHSA-866w-xmhq-wj7x"}],"prev":{"headline":"SvelteKit before 2.69.1 Denial of Service via Remote Form","id":"CVE-2026-82256"},"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 2.49.0 before 2.53.3 Denial of Service via form","id":"CVE-2026-82259","kev_date_added":null,"published":"2026-08-28"},{"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":"no","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 prototype pollution in remote form file inputs.","url":"https://insights.sbomify.com/CVE-2026-82257/"}