{"id":"CVE-2026-123824","title":"Symfony: XXE (Local File Read) in Config XmlUtils::parse() via validateOnParse = true","summary":"The Symfony Config component XmlUtils::parse() enables DTD validation before rejecting documents that carry a doctype, allowing XML external entity (XXE) injection in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.…","severity":"low","cvss":2.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-611"],"vendor":"sensiolabs","product":"symfony/config","affected":["symfony/config < 5.4.56","symfony/config >= 6.0.0 < 6.4.50","symfony/config >= 7.0.0 < 7.4.23","symfony/config >= 8.0.0 < 8.1.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T20:28:48.074549Z"},"published":"2026-11-06","updated":"2026-11-06","sourceUpdated":"2026-11-06T20:29:12.981Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123824","references":[{"url":"https://github.com/symfony/symfony/security/advisories/GHSA-5jff-8h8q-r5qx"},{"url":"https://github.com/symfony/symfony/commit/334ef21a6039355c05b123e7df60699be0e28da3"}],"tags":["cve.org"],"ingestedAt":"2026-11-06T18:00:12.518Z","epss":0.00272,"epssPercentile":0.19713,"slug":"CVE-2026-123824","body":"## Overview\n\nThe Symfony Config component XmlUtils::parse() enables DTD validation before rejecting documents that carry a doctype, allowing XML external entity (XXE) injection in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. A remote attacker who can supply XML to this method can determine whether local files exist, cause a denial of service, and, in some configurations, exfiltrate local file content via a crafted XML document whose doctype declares an external file:// entity.\nXmlUtils::parse() sets $dom->validateOnParse = true before calling loadXML() and only rejects documents carrying a doctype afterwards. Enabling DTD validation makes libxml resolve external entities during loadXML(), and LIBXML_NONET blocks http:// but not file://, so a file:// entity is read from disk before the doctype rejection runs. The content of the file is not returned to the caller, but the distinct libxml error for a missing path reveals whether a file exists, and an entity pointing at a large or slow file causes a denial of service. If the application registers a network-capable stream wrapper such as s3://, a parameter entity can also send the content of a local file to an external server. This is the same issue as CVE-2026-45071, which was fixed in the DomCrawler component but not in Config.\n\nApplications are affected if they pass untrusted XML to XmlUtils::parse() directly. The Symfony components that call it process developer-provided or operator-configured sources, such as configuration files and the XLIFF documents fetched by the translation providers.\n\n## Affected\n\n- `symfony/config < 5.4.56`\n- `symfony/config >= 6.0.0 < 6.4.50`\n- `symfony/config >= 7.0.0 < 7.4.23`\n- `symfony/config >= 8.0.0 < 8.1.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":13,"depthScoreParts":{"impact":12.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}