CVE-2026-25545 Astro has Full-Read SSRF in error rendering via Host: header injection

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page eg. 404.astro or 500.astro are vulnerable to SSRF. If the Host: header is changed to an attacker's server, it will be fetched on /500.html and they can redirect...

CVE-2026-25545

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page eg. 404.astro or 500.astro are vulnerable to SSRF. If the Host: header is changed to an attacker's server, it will be fetched on /500.html and they can redirect...

CVE-2026-25545 Astro has Full-Read SSRF in error rendering via Host: header injection

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page eg. 404.astro or 500.astro are vulnerable to SSRF. If the Host: header is changed to an attacker's server, it will be fetched on /500.html and they can redirect...

CVE-2026-25545

Astro SSRF in error rendering via Host header (CVE-2026-25545). Affected: Astro until version 9.5.4 and @astrojs/node before 9.5.4. Vulnerability arises when SSR error pages (e.g., 404/500) prerendered content fetches a URL constructed from the Host header, enabling an attacker to redirect to int...

Astro code issues and vulnerabilities

Astro is a content-driven website framework developed by Astro OpenSource. Versions of Astro prior to 9.5.4 had code vulnerabilities. These vulnerabilities stemmed from server-side rendering of pages, where errors were handled through server-side request forgeing, potentially allowing attackers t...

CVE-2026-25545: Server-Side Request Forgery (SSRF)

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page eg. 404.astro or 500.astro are vulnerable to SSRF. If the Host: header is changed to an attacker's server, it will be fetched on /500.html and they can redirect...

Astro has Full-Read SSRF in error rendering via Host: header injection

Summary Server-Side Rendered pages that return an error with a prerendered custom error page eg. 404.astro or 500.astro are vulnerable to SSRF. If the Host: header is changed to an attacker's server, it will be fetched on /500.html and they can redirect this to any internal URL to read the respon...

GHSA-QQ67-MVV5-FW3G Astro has Full-Read SSRF in error rendering via Host: header injection

Summary Server-Side Rendered pages that return an error with a prerendered custom error page eg. 404.astro or 500.astro are vulnerable to SSRF. If the Host: header is changed to an attacker's server, it will be fetched on /500.html and they can redirect this to any internal URL to read the respon...

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-2026-27125

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-2026-27119

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-2026-27121

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-2026-27125 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 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 vulnerability CVE-2026-27125 affects the framework prior to version 5.51.5 where attribute spreading () enumerates inherited properties from the prototype chain, potentially leaking attributes or causing SSR failures when Object.prototype is polluted. Client-side rendering is unaffecte...

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 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 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 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...