{"answers":{"affected":"2 open source packages ship an affected version, including dompurify. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49458 exists.","fix":"Upgrade dompurify to 3.4.6 or later.","what":"CVE-2026-49458 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 14 Jul 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-2026-49458 and fix it if it is affected.\n\nWhat it is: CVE-2026-49458 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 14 Jul 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49458 exists.\n\nAffected packages and fixed versions:\n- dompurify (npm): affected all versions; fixed in 3.4.6\n- dompurify (npm): affected all versions; fixed in 3.4.6\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-2026-49458/ (Markdown: https://insights.sbomify.com/CVE-2026-49458/index.md)","id":"CVE-2026-49458","markdown":"https://insights.sbomify.com/CVE-2026-49458/index.md","name":"CVE-2026-49458","record":{"aliases":["CLSA-2026-1785554485","DEBIAN-CVE-2026-49458","ECHO-620b-e534-5a35","GHSA-hpcv-96wg-7vj8","MINI-235q-85gv-mr4w","MINI-2864-2v5x-73q4","MINI-2f48-gvfw-hh9q","MINI-2pm6-76hh-8pg5","MINI-2rjf-8pc6-8737","MINI-343x-c7hg-9pf2","MINI-48gr-5wc3-jvg5","MINI-57x8-hhv8-4v3c","MINI-879g-w6c3-33w4","MINI-gmq6-57fx-rwgf","MINI-hgw4-h8ff-vj8j","MINI-hhm8-9f99-p9c2","MINI-j57v-ggv3-c5f2","MINI-jp23-hf32-pc27","MINI-q8fh-6r6x-m42v","MINI-r6w8-85fw-83qv","MINI-rj26-q4jj-rpw3","ROOT-APP-NPM-CVE-2026-49458","UBUNTU-CVE-2026-49458"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"JavaScript XSS sanitizer","requires_auth":"none","summary":"DOMPurify fails to sanitize cross-realm DOM nodes in IN_PLACE mode, allowing attackers to inject executable markup and achieve cross-site scripting.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"dompurify","vendor":"cure53"}],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"},{"id":"CWE-693","name":"Protection Mechanism Failure"},{"id":"CWE-501","name":"Trust Boundary Violation"}],"description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks","id":"CVE-2026-49458","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM","id":"CVE-2026-49459"},"packages":[{"ecosystem":"npm","fixed":["3.4.6"],"introduced":["0"],"last_affected":[],"package":"dompurify","purl":null,"source":"GHSA-hpcv-96wg-7vj8"},{"ecosystem":"npm","fixed":["3.4.6"],"introduced":["0"],"last_affected":[],"package":"dompurify","purl":"pkg:npm/dompurify","source":"GHSA-hpcv-96wg-7vj8"}],"prev":{"headline":"QUIC has Broken TLS verification","id":"CVE-2026-49457"},"products":["DOMPurify"],"published":"2026-07-14","related":[{"cvss_score":10,"headline":"DOMPurify nesting-based mXSS","id":"CVE-2024-47875","kev_date_added":null,"published":"2024-10-11"},{"cvss_score":9.1,"headline":"DOMPurify vulnerable to tampering by prototype polution","id":"CVE-2024-48910","kev_date_added":null,"published":"2024-10-31"},{"cvss_score":8.2,"headline":"DOMPurify XSS via `selectedcontent` re-clone","id":"CVE-2026-47423","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":7.3,"headline":"Tampering by prototype polution in DOMPurify","id":"CVE-2024-45801","kev_date_added":null,"published":"2024-09-16"},{"cvss_score":6.3,"headline":"DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside \u003ctemplate\u003e.content","id":"CVE-2026-49978","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":6.1,"headline":"DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM","id":"CVE-2026-49459","kev_date_added":null,"published":"2026-07-14"}],"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["cure53"]},"summary":"DOMPurify fails to sanitize cross-realm DOM nodes in IN_PLACE mode, allowing attackers to inject executable markup and achieve cross-site scripting.","url":"https://insights.sbomify.com/CVE-2026-49458/"}