CVE-2025-59728

When calculating the content path in handling of MPEG-DASH manifests, there's an out-of-bounds NUL-byte write one byte past the end of the buffer.When we call xmlNodeGetContentbelow [0], it returns a buffer precisely allocated to match the string length, using strdupinternally. If this buffer is not an empty string, it is assigned to root_urlat [1].If the last (non-NUL) byte in this buffer is not '/'then we append '/'in-place at [2]. This will write two bytes into the buffer, starting at the last valid byte in the buffer, writing the NUL byte beyond the end of the allocated buffer.
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