CVE-2026-42567

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Source
https://cve.org/CVERecord?id=CVE-2026-42567
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42567.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42567
Aliases
Published
2026-06-09T16:22:22.703Z
Modified
2026-07-08T08:13:25.764217955Z
Severity
  • 5.9 (Medium) CVSS_V4 - 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 Calculator
Summary
Svelte: ReDoS in `<svelte:element>` Tag Validation
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42567.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1333"
    ]
}
References

Affected packages

Git / github.com/sveltejs/svelte

Affected ranges

Type
GIT
Repo
https://github.com/sveltejs/svelte
Events
Introduced
8ea33bf7fe86d0d53cbe4104419cda9b4bb0442f
Fixed
4d8f99a2709e3c02e48d8bc6c77458f4ba49d0e3
Database specific 
{
    "cpe": "cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*",
    "extracted_events": [
        {
            "introduced": "5.51.5"
        },
        {
            "fixed": "5.55.7"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

svelte@5.*
svelte@5.51.5
svelte@5.52.0
svelte@5.53.0
svelte@5.53.1
svelte@5.53.10
svelte@5.53.11
svelte@5.53.12
svelte@5.53.13
svelte@5.53.2
svelte@5.53.3
svelte@5.53.4
svelte@5.53.5
svelte@5.53.6
svelte@5.53.7
svelte@5.53.8
svelte@5.53.9
svelte@5.54.0
svelte@5.54.1
svelte@5.55.0
svelte@5.55.1
svelte@5.55.2
svelte@5.55.3
svelte@5.55.4
svelte@5.55.5
svelte@5.55.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42567.json"