VulnerabilityAnalyzed
CVE-2026-42567
Svelte is a performance oriented web framework.
MEDIUM 5.9EPSS 0.45%
Does this matter?
Lower severity and a low EPSS score (0.45%). Track it; it rarely justifies an emergency change on its own.
Description
Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.
- CVSS 4.0
- 5.9 MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.45% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1333
- 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-9rmh-mm8f-r9h6Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.