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CVE-2026-107381 is a case-sensitivity flaw in enshrined/svg-sanitize that allows nested SVG <use> structures to bypass denial-of-service protection. Resolver::processReferences() selects href attributes case-sensitively before Sanitizer::cleanHrefAttributes() normalizes their names. Mixed-case attributes therefore conceal references during reference collection, but those references become active in the sanitized output after normalization. Malicious SVG structures can consequently reach downstream renderers and potentially cause resource exhaustion.
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A vulnerability affecting enshrined/svg-sanitize, classified under CWE-178 and CWE-400. The listed CVSS v3 score is 6.5 (Medium), indicating network-based exploitation requiring user interaction, with high availability impact and no confidentiality or integrity impact. The vulnerability and patch were published on October 8, 2026.
A denial-of-service protection bypass in enshrined/svg-sanitize. Case-sensitive reference-graph construction overlooks mixed-case href attributes, which are subsequently canonicalized, leaving potentially dangerous nested SVG references intact. The supplied proof of concept demonstrates the bypass on version 0.22.0, preserving all 201 use elements, but does not measure downstream renderer CPU or memory consumption. The affected range covers versions before 1.0.0.
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