{"affected":[{"defaultStatus":"unaffected","ecosystem":"https://packagist.org/packages/symfony/config","packageName":"symfony/config","product":"symfony","source":"CNA: Checkmarx","vendor":"sensiolabs","versions":[{"lessThan":"5.4.56","status":"affected","version":"0","versionType":"git"},{"lessThan":"6.4.50","status":"affected","version":"6.0.0","versionType":"git"},{"lessThan":"7.4.23","status":"affected","version":"7.0.0","versionType":"git"},{"lessThan":"8.1.11","status":"affected","version":"8.0.0","versionType":"git"}]}],"cveId":"CVE-2026-123824","cwes":["CWE-611"],"description":"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 7.4.23, 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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":2.3,"severity":"low","source":"CNA: Checkmarx","vector":"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","version":"4.0"},{"score":6.3,"severity":"medium","source":"ADP: CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","version":"3.1"}],"modifiedAt":1793996952981,"publishedAt":1793985564750,"references":[{"source":"CNA: Checkmarx","tags":["third-party-advisory"],"url":"https://github.com/symfony/symfony/security/advisories/GHSA-5jff-8h8q-r5qx"},{"source":"CNA: Checkmarx","tags":["patch"],"url":"https://github.com/symfony/symfony/commit/334ef21a6039355c05b123e7df60699be0e28da3"}],"remediation":[{"kind":"fix","source":"CNA: Checkmarx","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/symfony/symfony/commit/334ef21a6039355c05b123e7df60699be0e28da3"}],"revision":"b9f772e4e75ee9d258320303831f0cc88e97b0ed215dcc61252465272a03e5d8","sources":[{"modifiedAt":1793996952981,"name":"CNA: Checkmarx","retrievedAt":1793999355822,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123824"}],"ssvc":{"assessedAt":1793996928074,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Symfony: XXE (Local File Read) in Config XmlUtils::parse() via validateOnParse = true","updatedAt":1793999355822}