VulnerabilityModified
CVE-2026-42573
Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks.
MEDIUM 5.3EPSS 0.34%
Does this matter?
Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.
Description
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
- CVSS 4.0
- 5.3 MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- svelte/svelte
- Source
- security-advisories@github.com
References
- https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7Product, Release Notes
- https://github.com/sveltejs/svelte/security/advisories/GHSA-rcqx-6q8c-2c42Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-42573
- https://bugzilla.redhat.com/show_bug.cgi?id=2487093
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42573.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.