SVG (or “scalable vector graphics”) elements define vector-based website graphics in XML format. For screen readers and other assistive technologies, svg elements should include an aria-label attribute that includes alt text to describe the vector image used.
If you cannot use a label attribute on an SVG element, you can use aria-label to meet accessibility standards and provide context for assistive technologies.
Solution: Ensure SVG elements with an img, graphics-document or graphics-symbol role have an accessible alt attribute.
Read more at the Lumar A11y Wiki.