{"answers":{"affected":"2 open source packages ship an affected version, including svelte. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42567 in the wild and no public exploit code.","fix":"Upgrade svelte to 5.55.7 or later.","what":"CVE-2026-42567 is a medium-severity denial of service vulnerability in sveltejs svelte, published on 9 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42567 and fix it if it is affected.\n\nWhat it is: CVE-2026-42567 is a medium-severity denial of service vulnerability in sveltejs svelte, published on 9 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-42567 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- svelte (npm): affected from 5.51.5; fixed in 5.55.7\n- svelte (npm): affected from 5.51.5; fixed in 5.55.7\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-2026-42567/ (Markdown: https://insights.sbomify.com/CVE-2026-42567/index.md)","id":"CVE-2026-42567","markdown":"https://insights.sbomify.com/CVE-2026-42567/index.md","name":"CVE-2026-42567","record":{"aliases":["GHSA-9rmh-mm8f-r9h6"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Svelte web framework","requires_auth":"high_privilege","summary":"An attacker can cause a denial of service by triggering exponential time complexity in Svelte's internal regex validation for dynamic elements.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"svelte","vendor":"svelte"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1333","name":"Inefficient Regular Expression Complexity"}],"description":"Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in \u003csvelte:element this={tag}\u003e\u003c/svelte:element\u003e. This issue has been patched in version 5.55.7.","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: ReDoS in `\u003csvelte:element\u003e` Tag Validation","id":"CVE-2026-42567","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":"Yamcs Vulnerable to LDAP Injection in LdapAuthModule","id":"CVE-2026-42568"},"packages":[{"ecosystem":"npm","fixed":["5.55.7"],"introduced":["5.51.5"],"last_affected":[],"package":"svelte","purl":null,"source":"GHSA-9rmh-mm8f-r9h6"},{"ecosystem":"npm","fixed":["5.55.7"],"introduced":["5.51.5"],"last_affected":[],"package":"svelte","purl":"pkg:npm/svelte","source":"GHSA-9rmh-mm8f-r9h6"}],"prev":{"headline":"Meshtastic: Malformed UTF-8 in User.long_name broadcast over LoRa causes mesh-wide client decode failure","id":"CVE-2026-42566"},"products":["svelte"],"published":"2026-06-09","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":5.4,"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":"2026-06-09","vendors":["sveltejs"]},"summary":"An attacker can cause a denial of service by triggering exponential time complexity in Svelte's internal regex validation for dynamic elements.","url":"https://insights.sbomify.com/CVE-2026-42567/"}