{"answers":{"affected":"1 open source package ship an affected version, including html_sanitize_ex. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-66829 in the wild and no public exploit code.","fix":"Upgrade html_sanitize_ex to a fixed version for your release line: 1.4.5 or 1.5.3.","what":"CVE-2026-66829 is a low-severity vulnerability in rrrene html_sanitize_ex, published on 6 Aug 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-2026-66829 and fix it if it is affected.\n\nWhat it is: CVE-2026-66829 is a low-severity vulnerability in rrrene html_sanitize_ex, published on 6 Aug 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: There is no known exploitation of CVE-2026-66829 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- html_sanitize_ex (Hex): affected from 0.3.1; fixed in 1.4.5, 1.5.3\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-2026-66829/ (Markdown: https://insights.sbomify.com/CVE-2026-66829/index.md)","id":"CVE-2026-66829","markdown":"https://insights.sbomify.com/CVE-2026-66829/index.md","name":"CVE-2026-66829","record":{"aliases":["EEF-CVE-2026-66829","GHSA-2c6f-3j54-xpcr","GHSA-c486-5fvq-fp3v"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Elixir HTML sanitizer","requires_auth":"none","summary":"Attackers can force users to redirect to malicious sites via meta refresh tags in sanitized HTML, requiring an upgrade to the html_sanitize_ex library.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"EEF","cpe":[{"product":"htmlsanitizeex","vendor":"rrrene"}],"cvss":{"score":2.3,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a \u003cmeta http-equiv=\"refresh\"\u003e element in sanitized HTML. HtmlSanitizeEx.html5/1 keeps attacker-supplied \u003cmeta\u003e elements in its output. A meta element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as Content-Security-Policy.\n\nThis is not cross-site scripting. Browsers do not navigate a meta refresh to a javascript: URL, so the uppercase JAVASCRIPT: filter bypass yields no script execution and none was demonstrated.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.","ecosystems":["Hex"],"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":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cross-origin redirection","id":"CVE-2026-66829","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Hex","product":null,"products":[],"type":"open_redirect","year":"2026"},"n_packages":1,"n_references":5,"next":{"headline":"Mira Hormone Monitor, Mira Android App Use of GET request method with sensitive query strings","id":"CVE-2026-66832"},"packages":[{"ecosystem":"Hex","fixed":["1.4.5","1.5.3"],"introduced":["0.3.1","1.5.0-rc.0"],"last_affected":[],"package":"html_sanitize_ex","purl":"pkg:hex/html_sanitize_ex","source":"EEF-CVE-2026-66829"}],"prev":{"headline":"Cross-Site Scripting via Unsafe URL Schemes in Pivotick Property Links","id":"CVE-2026-66825"},"products":["html_sanitize_ex"],"published":"2026-08-06","related":[{"cvss_score":8.2,"headline":"Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service","id":"CVE-2026-68749","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":8.2,"headline":"Quadratic sibling re-flattening in the html_sanitize_ex traversal engine allows CPU-exhaustion denial of service","id":"CVE-2026-68750","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":4.8,"headline":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allowing form hijacking","id":"CVE-2026-66370","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":2.3,"headline":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied `\u003cobject\u003e` elements, allowing untrusted content embedding","id":"CVE-2026-66843","kev_date_added":null,"published":"2026-08-06"},{"cvss_score":2.3,"headline":"CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input","id":"CVE-2026-68747","kev_date_added":null,"published":"2026-08-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Erlang Ecosystem Foundation","prefix":"EEF"},{"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-19","vendors":["rrrene"]},"summary":"Attackers can force users to redirect to malicious sites via meta refresh tags in sanitized HTML, requiring an upgrade to the html_sanitize_ex library.","url":"https://insights.sbomify.com/CVE-2026-66829/"}