cve.bz

CVE-2026-42567

5.9 mediumEPSS 0.5%

Medium (5.9) in svelte svelte. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in svelte 5.55.7.

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.

Severity

CVSS 4.0

5.9 medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWE
CWE-1333
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-9rmh-mm8f-r9h6npmsvelte>=5.51.5 <5.55.75.55.7

References

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