# CVE-2026-121446: svg-sanitizer 0.5.0 before 1.1.0 Incomplete url() Filtering in SVG Attributes

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

svg-sanitizer from 0.5.0 before 1.1.0 contains an incomplete filtering vulnerability that allows attackers to bypass remote URL removal by using CSS escape sequences inside url() in SVG presentation attributes. Attackers can supply SVG files with attributes like fill containing escaped slashes that browsers resolve to remote URLs, triggering external requests and enabling data exfiltration.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- darylldoyle / svg-sanitizer: ≥ 0.5.0; < 1.1.0 (affected, semver); 1.1.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-791

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-3vh3-jf65-656w (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/svg-sanitizer-0.5.0-before-1.1.0-incomplete-url-filtering-in-svg-attributes (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121446; retrieved 2026-11-03; source updated 2026-11-03

Revision: a2c4f84759bf5e025541b341e65ca503c6dd469a2ff6b01bfaa6ced0a872acb6

Canonical: https://y2.dev/cve/CVE-2026-121446

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Collected public records only. Check source status for coverage and freshness.