{"answers":{"affected":"2 open source packages ship an affected version, including @xmldom/xmldom.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-83612 exists.","fix":"Upgrade @xmldom/xmldom to 0.9.12 or later.","what":"CVE-2026-83612 is a high-severity denial of service vulnerability in @xmldom xmldom, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-83612 and fix it if it is affected.\n\nWhat it is: CVE-2026-83612 is a high-severity denial of service vulnerability in @xmldom xmldom, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-83612 exists.\n\nAffected packages and fixed versions:\n- @xmldom/xmldom (npm): affected from 0.9.0-beta.1; fixed in 0.9.12\n- @xmldom/xmldom (npm): affected from 0.9.0-beta.1; fixed in 0.9.12\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-2026-83612/ (Markdown: https://insights.sbomify.com/CVE-2026-83612/index.md)","id":"CVE-2026-83612","markdown":"https://insights.sbomify.com/CVE-2026-83612/index.md","name":"CVE-2026-83612","record":{"aliases":["CLSA-2026-1791571542","DEBIAN-CVE-2026-83612","GHSA-6mj3-qw4j-hgrw","ROOT-APP-NPM-CVE-2026-83612","UBUNTU-CVE-2026-83612"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript XML library","requires_auth":"none","summary":"Attackers can cause excessive CPU and memory consumption by providing malformed HTML to the xmldom parser, leading to denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-178","name":"Improper Handling of Case Sensitivity"}],"description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.1 until 0.9.12, HTML-mode parsing through DOMParser.parseFromString() mishandles a mixed-case closing tag for the script, style, textarea, or title raw-text elements. parseHtmlSpecialContent, selected by isHTMLRawTextElement or isHTMLEscapableRawTextElement, uses a case-sensitive indexOf() and then calls substring() with a missing-close result of negative one, causing unstable parser progression and quadratic output amplification. A small untrusted text/html document can consequently consume disproportionate CPU and memory when parsed and serialized. This issue is fixed in @xmldom/xmldom version 0.9.12.","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":"xmldom: HTML raw-text closing-tag case mismatch causes output amplification","id":"CVE-2026-83612","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"xmldom: Quadratic-time attribute deduplication","id":"CVE-2026-83613"},"packages":[{"ecosystem":"npm","fixed":["0.9.12"],"introduced":["0.9.0-beta.1"],"last_affected":[],"package":"@xmldom/xmldom","purl":null,"source":"GHSA-6mj3-qw4j-hgrw"},{"ecosystem":"npm","fixed":["0.9.12"],"introduced":["0.9.0-beta.1"],"last_affected":[],"package":"@xmldom/xmldom","purl":"pkg:npm/%40xmldom/xmldom","source":"GHSA-6mj3-qw4j-hgrw"}],"prev":{"headline":"xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content","id":"CVE-2026-83611"},"products":["xmldom"],"published":"2026-09-01","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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-01","vendors":["@xmldom","xmldom"]},"summary":"Attackers can cause excessive CPU and memory consumption by providing malformed HTML to the xmldom parser, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-83612/"}