{"answers":{"affected":"6 open source packages ship an affected version, including @xmldom/xmldom and xmldom.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-83611 exists.","fix":"Upgrade @xmldom/xmldom to a fixed version for your release line: 0.8.15 or 0.9.12.","what":"CVE-2026-83611 is a medium-severity 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-2026-83611 and fix it if it is affected.\n\nWhat it is: CVE-2026-83611 is a medium-severity 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-2026-83611 exists.\n\nAffected packages and fixed versions:\n- @xmldom/xmldom (npm): affected from 0.7.0; fixed in 0.8.15\n- @xmldom/xmldom (npm): affected from 0.7.0; fixed in 0.8.15\n- @xmldom/xmldom (npm): affected from 0.9.0; fixed in 0.9.12\n- @xmldom/xmldom (npm): affected from 0.9.0; fixed in 0.9.12\n- xmldom (npm): affected all versions up to 0.6.0; no fix listed\n- xmldom (npm): affected all versions up to 0.6.0; no fix listed\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-2026-83611/ (Markdown: https://insights.sbomify.com/CVE-2026-83611/index.md)","id":"CVE-2026-83611","markdown":"https://insights.sbomify.com/CVE-2026-83611/index.md","name":"CVE-2026-83611","record":{"aliases":["AZL-99363","CLEANSTART-2026-UU21916","DEBIAN-CVE-2026-83611","ECHO-d5f2-8667-21d1","GHSA-6h8r-xr42-gp59","MINI-277x-p334-j7xh","MINI-6m98-vvrw-xf4w","MINI-7pgh-4vfx-jg57","MINI-hh7c-xh7f-h3mg","UBUNTU-CVE-2026-83611"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript XML parser","requires_auth":"none","summary":"Attackers can bypass well-formedness validation gates in applications using xmldom by exploiting a parser differential that silently accepts malformed end tags.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1286","name":"Improper Validation of Syntactic Correctness of Input"}],"description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as \u003c/a\\njunk\u003e, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.","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: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content","id":"CVE-2026-83611","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":6,"n_references":7,"next":{"headline":"xmldom: HTML raw-text closing-tag case mismatch causes output amplification","id":"CVE-2026-83612"},"packages":[{"ecosystem":"npm","fixed":["0.8.15"],"introduced":["0.7.0"],"last_affected":[],"package":"@xmldom/xmldom","purl":null,"source":"GHSA-6h8r-xr42-gp59"},{"ecosystem":"npm","fixed":["0.8.15"],"introduced":["0.7.0"],"last_affected":[],"package":"@xmldom/xmldom","purl":"pkg:npm/%40xmldom/xmldom","source":"GHSA-6h8r-xr42-gp59"},{"ecosystem":"npm","fixed":["0.9.12"],"introduced":["0.9.0"],"last_affected":[],"package":"@xmldom/xmldom","purl":null,"source":"GHSA-6h8r-xr42-gp59"},{"ecosystem":"npm","fixed":["0.9.12"],"introduced":["0.9.0"],"last_affected":[],"package":"@xmldom/xmldom","purl":"pkg:npm/%40xmldom/xmldom","source":"GHSA-6h8r-xr42-gp59"},{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":["0.6.0"],"package":"xmldom","purl":null,"source":"GHSA-6h8r-xr42-gp59"},{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":["0.6.0"],"package":"xmldom","purl":"pkg:npm/xmldom","source":"GHSA-6h8r-xr42-gp59"}],"prev":{"headline":"xmldom: XML fragment injection via invalid EntityReference.nodeName during requireWellFormed serialization","id":"CVE-2026-83610"},"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 bypass well-formedness validation gates in applications using xmldom by exploiting a parser differential that silently accepts malformed end tags.","url":"https://insights.sbomify.com/CVE-2026-83611/"}