Medium severity6.1GHSA Advisory· Published Jun 9, 2026· Updated Jun 11, 2026

CVE-2026-42573

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
sveltenpm	< 5.55.7	5.55.7

Affected products

Sveltejs/SvelteGHSA
Range: <= 5.55.6
ghsa-coords
pkg:npm/svelte
Range: < 5.55.7

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-rcqx-6q8c-2c42ghsaADVISORY
github.com/sveltejs/svelte/security/advisories/GHSA-rcqx-6q8c-2c42nvdVendor AdvisoryWEB
nvd.nist.gov/vuln/detail/CVE-2026-42573ghsaADVISORY
github.com/sveltejs/svelte/releases/tag/svelte%405.55.7nvdProductRelease NotesWEB

News mentions

No linked articles in our index yet.

Severity

MediumCVSS v3.1

6.1/ 10

CVSS v45.3

CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack vector: Network
Complexity: Low
Privileges: None
User interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected

Source repo: github.com/sveltejs/svelte

EPSS

Probability of exploitation in the next 30 days.

0.21%

VYPR risk score

Composite of severity, exploitation, and reach.

0.33medium

cvss	0.397
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000

Weaknesses

CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE ID

CVE-2026-42573

Credits

D
dummdidumm
remediation_developer · ghsa
E
elliott-with-the-longest-name-on-github
remediation_reviewer · ghsa