CVE Explorer
CVE-2026-42567
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"svelte","vendor":"sveltejs","versions":[{"status":"affected","version":">= 5.51.5, < 5.55.7"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:c9fb8060f1fa93094193b90dd0479be4f7da89d06d10c7e641f2ab00c512ba91 · sha256:48f85f4879a575d8… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.9,"baseSeverity":"MEDIUM","privilegesRequired":"HIGH","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:c9fb8060f1fa93094193b90dd0479be4f7da89d06d10c7e641f2ab00c512ba91 · sha256:48f85f4879a575d8… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:c9fb8060f1fa93094193b90dd0479be4f7da89d06d10c7e641f2ab00c512ba91 · sha256:48f85f4879a575d8… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7","tags":["x_refsource_MISC"],"url":"https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:c9fb8060f1fa93094193b90dd0479be4f7da89d06d10c7e641f2ab00c512ba91 · sha256:48f85f4879a575d8… · /containers/cna/references/1
{"name":"https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:c9fb8060f1fa93094193b90dd0479be4f7da89d06d10c7e641f2ab00c512ba91 · sha256:48f85f4879a575d8… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.