Astro SSR - Server-Side Request Forgery

Astro before 5.17.3 and @astrojs/node before 9.5.4 are vulnerable to full-read SSRF due to improper Host header validation in error page rendering, allowing attackers to redirect requests and access internal resources. id: CVE-2026-25545 info: name: Astro SSR - Server-Side Request Forgery author:...

NPM: Astro: Host header SSRF in prerendered error page fetch

NPM: Astro: Host header SSRF in prerendered error page fetch vulnerability discovered by ? in WordPress Npm astro versions 6.4.6...

CVE-2026-54298

creationtimestamp| type| source ---|---|--- 2026-06-12 16:48:25+00:00| published-proof-of-concept| https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9...

Reusing a Nonce, Key Pair in Encryption

Overview astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind. Affected versions of this package are vulnerable to Reusing a Nonce, Key Pair in Encryption of server island parameters. An attacker can inject malicious HTML or script content into a...

Astro: XSS in define:vars via incomplete </script> tag sanitization

Summary The defineScriptVars function in Astro's server-side rendering pipeline uses a case-sensitive regex //g to sanitize values injected into inline tags via the define:vars directive. HTML parsers close elements case-insensitively and also accept whitespace or / before the closing , allowing ...

GHSA-G735-7G2W-HH3F Astro: Remote allowlist bypass via unanchored matchPathname wildcard

Summary This issue concerns Astro's remotePatterns path enforcement for remote URLs used by server-side fetchers such as the image optimization endpoint. The path matching logic for / wildcards is unanchored, so a pathname that contains the allowed prefix later in the path can still match. As a...

Allocation of Resources Without Limits or Throttling

Overview astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the /server-islands/name route handler, which buffers and parses the entire...

Use of Non-Canonical URL Paths for Authorization Decisions

Overview astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind. Affected versions of this package are vulnerable to Use of Non-Canonical URL Paths for Authorization Decisions due to improper URL decoding logic. The pathname validation used for...

Astro vulnerable to reflected XSS via the server islands feature

Summary After some research it appears that it is possible to obtain a reflected XSS when the server islands feature is used in the targeted application, regardless of what was intended by the component templates. Details Server islands run in their own isolated context outside of the page reques...

GHSA-HR2Q-HP5Q-X767 Astro vulnerable to URL manipulation via headers, leading to middleware and CVE-2025-61925 bypass

Summary In impacted versions of Astro using on-demand rendering, request headers x-forwarded-proto and x-forwarded-port are insecurely used, without sanitization, to build the URL. This has several consequences the most important of which are: - Middleware-based protected route bypass only via...

CVE-2025-55207

Astro is a web framework for content-driven websites. Following CVE-2025-54793 there's still an Open Redirect vulnerability in a subset of Astro deployment scenarios prior to version 9.4.1. Astro 5.12.8 addressed CVE-2025-54793 where https://example.com//astro.build/press would redirect to the...

GHSA-CQ8C-XV66-36GW Astros's duplicate trailing slash feature leads to an open redirection security issue

Summary There is an Open Redirection vulnerability in the trailing slash redirection logic when handling paths with double slashes. This allows an attacker to redirect users to arbitrary external domains by crafting URLs such as https://mydomain.com//malicious-site.com/. This increases the risk o...

Astros's duplicate trailing slash feature leads to an open redirection security issue

Summary There is an Open Redirection vulnerability in the trailing slash redirection logic when handling paths with double slashes. This allows an attacker to redirect users to arbitrary external domains by crafting URLs such as https://mydomain.com//malicious-site.com/. This increases the risk o...

PT-2025-32332

Name of the Vulnerable Software and Affected Versions Astro versions 5.2.0 through 5.12.7 Description Astro is susceptible to an Open Redirect vulnerability stemming from improper handling of paths containing double slashes in its trailing slash redirection logic. This allows an attacker to...