CVE-2026-54299

Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages /404 or /500 using export const prerender = true fetch those pages over HTTP at runtime when an error occurs. The URL for this fetch is derived from request.url, which in turn gets its origin from the incoming...

CVE-2026-54299 Astro: Host-header full-read SSRF in core prerendered error-page fetch (prerenderedErrorPageFetch default + unvalidated createRequestFromNodeRequest URL)

Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages /404 or /500 using export const prerender = true fetch those pages over HTTP at runtime when an error occurs. The URL for this fetch is derived from request.url, which in turn gets its origin from the incoming...

CVE-2026-54299

Summary of CVE-2026-54299 (Astro) : Astro SSR apps that prerender error pages (e.g., 404/500 with prerender = true) fetch those pages over HTTP using a URL derived from request.url, which is based on the Host header. If Host is not validated against allowedDomains, an attacker can direct the fetc...

CVE-2026-54299 Astro: Host-header full-read SSRF in core prerendered error-page fetch (prerenderedErrorPageFetch default + unvalidated createRequestFromNodeRequest URL)

Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages /404 or /500 using export const prerender = true fetch those pages over HTTP at runtime when an error occurs. The URL for this fetch is derived from request.url, which in turn gets its origin from the incoming...

CVE-2026-54298

Astro, prior to 6.4.6, is vulnerable to XSS via unescaped attribute names when spreading props onto HTML elements. The spreadAttributes path iterates over object keys and passes them to addAttribute, which interpolates the key into the HTML output without escaping, allowing attackers to inject ev...

CVE-2026-54298 Astro: XSS via Unescaped Attribute Names in Spread Props

Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax ...props ...

CVE-2026-54298 Astro: XSS via Unescaped Attribute Names in Spread Props

Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax ...props ...

CVE-2026-54298

Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax ...props ...

CVE-2026-50146

CVE-2026-50146 affects the Astro web framework prior to 6.3.3. When a component uses a client:* directive, Astro inserts named slot content into a data-astro-template attribute without escaping the slot name, allowing an attacker to break out of the attribute context and inject arbitrary HTML, re...

CVE-2026-50146 Astro: Reflected XSS via unescaped slot name

Astro is a web framework. Prior to 6.3.3, when a component uses a client: directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflect...

CVE-2026-50146

Astro is a web framework. Prior to 6.3.3, when a component uses a client: directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflect...

CVE-2026-50146 Astro: Reflected XSS via unescaped slot name

Astro is a web framework. Prior to 6.3.3, when a component uses a client: directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflect...

CVE-2026-54300

The CVE-2026-54300 issue affects the Astro package @astrojs/netlify (Netlify adapter). Before version 7.0.13, the adapter converts image.remotePatterns into Netlify Image CDN images.remote_images regexes with broader semantics than Astro’s canonical matcher. Specifically, wildcards like .example....

CVE-2026-54300

@astrojs/netlify is an adapter that allows Astro to deploy your hybrid or server rendered site to Netlify. Prior to 7.0.13, @astrojs/netlify converts Astro image.remotePatterns into Netlify Image CDN images.remoteimages regular expressions with broader semantics than Astro's canonical matcher. A...

CVE-2026-54300 @astrojs/netlify broadens Astro image.remotePatterns in Netlify Image CDN config

@astrojs/netlify is an adapter that allows Astro to deploy your hybrid or server rendered site to Netlify. Prior to 7.0.13, @astrojs/netlify converts Astro image.remotePatterns into Netlify Image CDN images.remoteimages regular expressions with broader semantics than Astro's canonical matcher. A...

Improper Access Control

@astrojs/netlify is vulnerable to Improper Access Control. The vulnerability is due to overly permissive conversion of Astro image.remotePatterns into Netlify Image CDN regular expressions, which allows an attacker to bypass intended hostname and pathname restrictions and access unintended remote...

Cross-site Scripting (XSS)

Astro is vulnerable to Cross-Site Scripting XSS. The vulnerability is due to improper HTML escaping of named slot content inserted into the data-astro-template attribute when using client: directives, which allows an attacker to break out of the attribute context and inject arbitrary HTML or...

@a1st/aix (>=0.0.3, <=0.6.0), @a1st/aix-core (>=0.2.0, <=0.6.0) +19 more potentially affected by CVE-2026-54298 via astro (>=6.0.0-beta.1, <=6.4.4)

astro NPM version =6.0.0-beta.1, =0.0.3, =0.2.0, =1.11.1, =2.7.0, =0.3.0, =1.4.1, =0.19.0, =0.19.0, =1.10.0, =1.0.0, =1.1.0 and more Source cves: CVE-2026-54298 Source advisory: SNYK:JS-ASTRO-17356187...

Cross-site Scripting (XSS)

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 Cross-site Scripting XSS via the addAttribute function, which interpolates unescaped object keys as HTML attribute names when spreadi...

GHSA-JRPJ-WCV7-9FH9 Astro: XSS via Unescaped Attribute Names in Spread Props

Summary The spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax ...props on an HTML element and the object...