# CVE-2026-121445: svg-sanitizer 1.0.0 before 1.1.0 ReDoS and Fail-Open via image-set CSS Stripping

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

darylldoyle svg-sanitizer from 1.0.0 before 1.1.0 contains a regular expression denial of service vulnerability in the image-set pattern of stripRemoteCssTokens() when removeRemoteReferences is enabled. Attackers can submit SVGs with many unclosed image-set tokens to exhaust CPU, or trigger PCRE limits causing sanitize() to throw a TypeError and leave unsanitized content.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- darylldoyle / svg-sanitizer: ≥ 1.0.0; < 1.1.0 (affected, semver); 1.1.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.2 (high); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.9 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-754

## Exploit evidence

- exploit: https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-94x8-pw3c-6qcq (ADP: CISA-ADP)

## References

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-94x8-pw3c-6qcq (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/svg-sanitizer-1.0.0-before-1.1.0-redos-and-fail-open-via-image-set-css-stripping (CNA: VulnCheck; third-party-advisory)

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-94x8-pw3c-6qcq (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121445; retrieved 2026-11-03; source updated 2026-11-03

Revision: cd213fa92312a3b707ae150151093a261f63404d22f5a95bb8ad1c5a095e300e

Canonical: https://y2.dev/cve/CVE-2026-121445

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