{"answers":{"affected":"2 open source packages ship an affected version, including svelte. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-27125 in the wild and no public exploit code.","fix":"Upgrade svelte to 5.51.5 or later.","what":"CVE-2026-27125 is a medium-severity vulnerability in sveltejs svelte, published on 20 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-27125 and fix it if it is affected.\n\nWhat it is: CVE-2026-27125 is a medium-severity vulnerability in sveltejs svelte, published on 20 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-27125 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- svelte (npm): affected all versions; fixed in 5.51.5\n- svelte (npm): affected all versions; fixed in 5.51.5\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-2026-27125/ (Markdown: https://insights.sbomify.com/CVE-2026-27125/index.md)","id":"CVE-2026-27125","markdown":"https://insights.sbomify.com/CVE-2026-27125/index.md","name":"CVE-2026-27125","record":{"aliases":["GHSA-crpf-4hrx-3jrp"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Svelte web framework","requires_auth":"low_privilege","summary":"Svelte SSR attribute spreading includes prototype chain properties, potentially causing errors or unexpected output if Object.prototype is polluted.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"svelte","vendor":"svelte"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-915","name":"Improperly Controlled Modification of Dynamically-Determined Object Attributes"}],"description":"svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. \u003cdiv {...attrs}\u003e) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.","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":true,"headline":"Svelte SSR attribute spreading includes inherited properties from prototype chain","id":"CVE-2026-27125","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Craft CMS has Stored XSS in Table Field via \"HTML\" Column Type","id":"CVE-2026-27126"},"packages":[{"ecosystem":"npm","fixed":["5.51.5"],"introduced":["0"],"last_affected":[],"package":"svelte","purl":null,"source":"GHSA-crpf-4hrx-3jrp"},{"ecosystem":"npm","fixed":["5.51.5"],"introduced":["0"],"last_affected":[],"package":"svelte","purl":"pkg:npm/svelte","source":"GHSA-crpf-4hrx-3jrp"}],"prev":{"headline":"FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities","id":"CVE-2026-27124"},"products":["svelte"],"published":"2026-02-20","related":[{"cvss_score":7.8,"headline":"Code injection in n/a","id":"CVE-2021-29261","kev_date_added":null,"published":"2021-04-05"},{"cvss_score":5.9,"headline":"Svelte: ReDoS in `\u003csvelte:element\u003e` Tag Validation","id":"CVE-2026-42567","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":5.4,"headline":"Potential mXSS vulnerability due to improper HTML escaping in svelte","id":"CVE-2024-45047","kev_date_added":null,"published":"2024-08-30"},{"cvss_score":5.4,"headline":"Cross-site Scripting (XSS)","id":"CVE-2022-25875","kev_date_added":null,"published":"2022-07-12"},{"cvss_score":5.3,"headline":"Svelte: XSS via DOM Clobbering of Internal Framework State","id":"CVE-2026-42573","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":5.3,"headline":"Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`","id":"CVE-2026-27901","kev_date_added":null,"published":"2026-02-26"},{"cvss_score":5.3,"headline":"Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers","id":"CVE-2026-27902","kev_date_added":null,"published":"2026-02-26"}],"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":"2026-02-25","vendors":["sveltejs"]},"summary":"Svelte SSR attribute spreading includes prototype chain properties, potentially causing errors or unexpected output if Object.prototype is polluted.","url":"https://insights.sbomify.com/CVE-2026-27125/"}