CVE-2026-42567

CVE-2026-42567 affects Svelte runtimes from 5.51.5 up to 5.55.6, where an internal regex used during svelte:element tag validation can cause exponential-time processing (ReDoS) on certain tag names. The issue is triggered during the validation of , leading to significant CPU usage and potential...

EUVD-2026-35702

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 . This issue has been patched in version 5.55.7...

CVE-2026-42567 Svelte: ReDoS in `<svelte:element>` Tag Validation

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 . This issue has been patched in version 5.55.7...

NPM: Svelte: ReDoS in `<svelte:element>` Tag Validation

NPM: Svelte: ReDoS in Tag Validation vulnerability discovered by ? in WordPress Npm svelte versions = 5.51.5, = 5.55.6...

CVE-2026-27119

svelte performance oriented web framework. From 5.39.3, element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5...

CVE-2026-27125

svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements e.g. enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a...

CVE-2026-27125 Svelte SSR attribute spreading includes inherited properties from prototype chain

svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements e.g. enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a...

CVE-2026-27125 Svelte SSR attribute spreading includes inherited properties from prototype chain

svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements e.g. enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a...

CVE-2026-27122 Svelte SSR does not validate dynamic element tag names in `<svelte:element>`

svelte performance oriented web framework. Prior to 5.51.5, when using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output...

CVE-2026-27122

svelte performance oriented web framework. Prior to 5.51.5, when using in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output...

CVE-2026-27122

CVE-2026-27122 affects the Svelte performance-oriented web framework. In server-side rendering, using allows an unvalidated tag name to be emitted in HTML output, enabling HTML injection. Client-side rendering is not impacted. The vulnerability is addressed by upgrading to version 5.51.5. The av...

CVE-2026-27121 Svelte affected by cross-site scripting via spread attributes in Svelte SSR

svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting XSS during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an...

CVE-2026-27119 Svelte affected by XSS in SSR `<option>` element

svelte performance oriented web framework. From 5.39.3, element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5...

CVE-2026-27119

svelte performance oriented web framework. From 5.39.3, =5.51.4, in certain circumstances, the server-side rendering output of an element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed...

CVE-2026-27119 Svelte affected by XSS in SSR `<option>` element

svelte performance oriented web framework. From 5.39.3, element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5...

CVE-2026-27119 Svelte affected by XSS in SSR `<option>` element

svelte performance oriented web framework. From 5.39.3, element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5...

CVE-2026-27119

CVE-2026-27119 affects the Svelte framework’s server-side rendering output for the element, where content may not be properly escaped in certain conditions (versions 5.39.3 through 5.51.4). This can lead to HTML injection in SSR output, while client-side rendering remains unaffected. The vulnera...

PT-2026-21305

Name of the Vulnerable Software and Affected Versions Svelte versions 5.39.3 through 5.51.4 Description Svelte is susceptible to a flaw where, under specific conditions, the server-side rendering of an element fails to properly escape its content. This can lead to potential HTML injection within...