{"apiVersion":"1.0","identifier":"CVE-2026-4671","description":"justhtml before 1.18.0 contains multiple low-severity denial-of-service issues in CSS selector handling and linkification. Applications that evaluate attacker-controlled selector strings (via query(), matches(), or selector-based transforms), run selector matching over very large untrusted documents, construct DOM trees from untrusted structure, or enable linkification over attacker-controlled text may consume disproportionate CPU or memory. Triggers include oversized selectors, large selector lists, oversized compound selectors, long combinator chains, deeply nested functional pseudo-classes, repeated token/positional matching, cyclic DOM graphs causing non-terminating traversal, and punctuation-heavy or trailing-bracket linkification input. These are availability-only concerns and do not by themselves allow script execution, data disclosure, or sanitizer bypass. Default JustHTML(sanitize=True) usage is not expected to be exposed, since selectors are normally supplied by application code.","publishedAt":"2026-08-23T14:16:53","lastModifiedAt":"2026-08-26T17:10:53","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-4671","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00372,"riskScore":0.78,"affectedProduct":"justhtml","affectedVersions":"<1.18.0","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-4671","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-4671","en":"https://www.redsauce.net/en/cves/CVE-2026-4671","fr":"https://www.redsauce.net/fr/cves/CVE-2026-4671","pt":"https://www.redsauce.net/pt/cves/CVE-2026-4671","de":"https://www.redsauce.net/de/cves/CVE-2026-4671","sk":"https://www.redsauce.net/sk/cves/CVE-2026-4671","el":"https://www.redsauce.net/el/cves/CVE-2026-4671"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-4671"}}