{"api_version":"1","generated_at":"2026-11-07T18:32:04+00:00","cve":"CVE-2026-121623","urls":{"html":"https://cve.report/CVE-2026-121623","api":"https://cve.report/api/cve/CVE-2026-121623.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-121623","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-121623"},"summary":{"title":"Symfony: DataUriNormalizer Opens Data URIs With a Non-Lowercase Scheme as Local Files, Letting a Client Read Any Server File","description":"The Symfony Serializer component DataUriNormalizer::denormalize() matches the data: scheme with a case-sensitive regular expression, allowing a value with an uppercase scheme, such as DATA:,/../../../etc/passwd, to bypass it, resulting in Arbitrary Local File Read through Path Traversal 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.\n\nA value whose scheme is not lowercase data: are treated as a local file path and opened instead of being decoded as inline data, so the resulting File, \\SplFileInfo, or \\SplFileObject points at a file on the server, which the application then handles as the uploaded content.\n\nAny endpoint that deserializes untrusted input into one of these types is affected. 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Serializer component <code>DataUriNormalizer::denormalize()</code> matches the <code>data:</code> scheme with a case-sensitive regular expression, allowing a value with an uppercase scheme, such as <code>DATA:,/../../../etc/passwd</code>, to bypass it, resulting in Arbitrary Local File Read through Path Traversal 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.</div><div><span>A value whose scheme is not lowercase </span><code>data:</code>&nbsp;are treated as a local file path and opened instead of being decoded as inline data, so the resulting <code>File</code>, <code>\\SplFileInfo</code>, or <code>\\SplFileObject</code> points at a file on the server, which the application then handles as the uploaded content.</div>Any endpoint that deserializes untrusted input into one of these types is affected. <code>FrameworkBundle</code> registers <code>DataUriNormalizer</code> ahead of <code>ObjectNormalizer</code> by default. 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FrameworkBundle registers DataUriNormalizer ahead of ObjectNormalizer by default. A single request with a crafted DATA: value is enough to read arbitrary local files that the application can access, with no authentication needed if the endpoint is public.","Type":"Description","Title":"Symfony: DataUriNormalizer Opens Data URIs With a Non-Lowercase "}]}}}