{"answers":{"affected":"2 open source packages ship an affected version, including dompurify.","exploited":"There is no known exploitation of CVE-2026-116803 in the wild and no public exploit code.","fix":"Upgrade dompurify to 3.4.17 or later.","what":"CVE-2026-116803 is a medium-severity vulnerability in cure53 DOMPurify, published on 26 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-116803 and fix it if it is affected.\n\nWhat it is: CVE-2026-116803 is a medium-severity vulnerability in cure53 DOMPurify, published on 26 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-116803 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- dompurify (npm): affected all versions; fixed in 3.4.17\n- dompurify (npm): affected all versions; fixed in 3.4.17\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-2026-116803/ (Markdown: https://insights.sbomify.com/CVE-2026-116803/index.md)","id":"CVE-2026-116803","markdown":"https://insights.sbomify.com/CVE-2026-116803/index.md","name":"CVE-2026-116803","record":{"aliases":["CLSA-2026-1793097032","CLSA-2026-1793097070","CLSA-2026-1793097137","CLSA-2026-1793097251","CLSA-2026-1793097362","CLSA-2026-1793097542","CLSA-2026-1793097697","CLSA-2026-1793101643","CLSA-2026-1793101664","CLSA-2026-1793101714","CLSA-2026-1793101764","CLSA-2026-1793101815","CLSA-2026-1793101830","CLSA-2026-1793101846","CLSA-2026-1793109624","CLSA-2026-1793109867","CLSA-2026-1793110512","CLSA-2026-1793112297","CLSA-2026-1793120016","CLSA-2026-1793120032","CLSA-2026-1793120128","CLSA-2026-1793120140","CLSA-2026-1793126384","CLSA-2026-1793126491","CLSA-2026-1793127475","CLSA-2026-1793127593","CLSA-2026-1793129489","CLSA-2026-1793129671","DEBIAN-CVE-2026-116803","ECHO-bfc0-faec-9098","GHSA-77h4-4vqj-j7vc","GHSA-mrv2-3pqr-j5jr","ROOT-APP-NPM-GHSA-mrv2-3pqr-j5jr","UBUNTU-CVE-2026-116803"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to keep event handlers armed when an IN_PLACE hook removes a parent or sibling node. Attacker markup in detached subtrees is never walked or neutralized, so handlers like img onerror fire after sanitize() returns, causing DOM XSS.","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":"DOMPurify before 3.4.17 DOM XSS via IN_PLACE Hook-Detached Subtrees","id":"CVE-2026-116803","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"DOMPurify from 3.4.4 before 3.4.17 SAFE_FOR_TEMPLATES Bypass via Shadow Root Content","id":"CVE-2026-116804"},"packages":[{"ecosystem":"npm","fixed":["3.4.17"],"introduced":["0"],"last_affected":[],"package":"dompurify","purl":null,"source":"GHSA-mrv2-3pqr-j5jr"},{"ecosystem":"npm","fixed":["3.4.17"],"introduced":["0"],"last_affected":[],"package":"dompurify","purl":"pkg:npm/dompurify","source":"GHSA-mrv2-3pqr-j5jr"}],"prev":{"headline":"DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode","id":"CVE-2026-116802"},"products":["DOMPurify"],"published":"2026-10-26","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-26","vendors":["cure53"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-116803/"}