{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-6653","sourceIdentifier":"security@ubuntu.com","published":"2026-06-22T14:17:51.113","lastModified":"2026-10-25T23:10:00.167","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling."},{"lang":"es","value":"Uso después de liberación en xmlParseInternalSubset de libxml2 desde la versión 2.9.11 hasta la 2.11.0 de GNOME libxml2 permite a un atacante remoto causar una denegación de servicio mediante una entrada XML maliciosamente elaborada con un manejo inadecuado de la resolución de entidades."}],"affected":[{"source":"security@ubuntu.com","affectedData":[{"vendor":"GNOME","product":"libxml2","defaultStatus":"unaffected","packageName":"libxml2","repo":"https://gitlab.gnome.org/GNOME/libxml2","versions":[{"version":"2.9.11","lessThan":"2.11.0","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security@ubuntu.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":7.0,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"PROOF_OF_CONCEPT","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-22T15:51:00.508541Z","id":"CVE-2026-6653","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security@ubuntu.com","type":"Secondary","description":[{"lang":"en","value":"CWE-416"},{"lang":"en","value":"CWE-611"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*","versionStartIncluding":"2.9.11","versionEndIncluding":"2.11.0","matchCriteriaId":"52D9DF90-B6D6-4520-AB52-DCC1F17711F4"}]}]}],"references":[{"url":"https://bugs.launchpad.net/ubuntu/+source/libxml2/+bug/2141260","source":"security@ubuntu.com","tags":["Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058","source":"security@ubuntu.com","tags":["Exploit","Issue Tracking","Patch"]}]}}