{"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-2026-83606 exists.","fix":"Upgrade @xmldom/xmldom to 0.9.11 or later.","what":"CVE-2026-83606 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-2026-83606 and fix it if it is affected.\n\nWhat it is: CVE-2026-83606 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-2026-83606 exists.\n\nAffected packages and fixed versions:\n- @xmldom/xmldom (npm): affected from 0.9.0-beta.9; fixed in 0.9.11\n- @xmldom/xmldom (npm): affected from 0.9.0-beta.9; fixed in 0.9.11\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-2026-83606/ (Markdown: https://insights.sbomify.com/CVE-2026-83606/index.md)","id":"CVE-2026-83606","markdown":"https://insights.sbomify.com/CVE-2026-83606/index.md","name":"CVE-2026-83606","record":{"aliases":["CLSA-2026-1791369737","DEBIAN-CVE-2026-83606","GHSA-g53g-w8rj-fmg7","UBUNTU-CVE-2026-83606"],"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":"An attacker can cause a denial of service by sending a small, malformed XML input that triggers quadratic backtracking in the parser, stalling the application.","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-1333","name":"Inefficient Regular Expression Complexity"}],"description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.9 until 0.9.11, the processing-instruction production in lib/grammar.js lets the greedy S+ separator and lazy Char*? data group repeatedly repartition a long whitespace tail when the required closing ?\u003e is absent. Both parsePI and parseProcessingInstruction apply the expression to the entire remaining source, causing quadratic backtracking during DOMParser.parseFromString() under default options and allowing a small unauthenticated XML input to stall the Node.js event loop. This issue is fixed in @xmldom/xmldom version 0.9.11.","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 PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructions","id":"CVE-2026-83606","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: Element name injection via createElement() bypasses requireWellFormed","id":"CVE-2026-83607"},"packages":[{"ecosystem":"npm","fixed":["0.9.11"],"introduced":["0.9.0-beta.9"],"last_affected":[],"package":"@xmldom/xmldom","purl":null,"source":"GHSA-g53g-w8rj-fmg7"},{"ecosystem":"npm","fixed":["0.9.11"],"introduced":["0.9.0-beta.9"],"last_affected":[],"package":"@xmldom/xmldom","purl":"pkg:npm/%40xmldom/xmldom","source":"GHSA-g53g-w8rj-fmg7"}],"prev":{"headline":"xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed","id":"CVE-2026-83605"},"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":"An attacker can cause a denial of service by sending a small, malformed XML input that triggers quadratic backtracking in the parser, stalling the application.","url":"https://insights.sbomify.com/CVE-2026-83606/"}