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#17035197e50e Thanks @astrobot-houston! - Fixes getRelativeLocaleUrl, getAbsoluteLocaleUrl, and getAbsoluteLocaleUrlList to strip trailing slashes when trailingSlash: 'never' is configured
Previously, any URL containing a double-encoded character (like %255B, which is [ encoded twice) was unconditionally rejected with a 400 Bad Request before middleware or route handlers could run. This broke embedded tools like Sanity Studio whose client-side router legitimately produces double-encoded URLs.
The fix replaces the rejection approach with iterative decoding — multi-level percent-encoding is now fully resolved to its canonical form before being passed to middleware and route matching. This preserves the security fix for CVE-2025-66202 (middleware authorization bypass via double encoding) because middleware now always sees the fully decoded path, making bypass impossible. For example, /api/%2561dmin is decoded to /api/admin, which middleware can correctly block.
#170662f4d92a Thanks @matthewp! - Fixes prerendered redirect targets being incorrectly bundled into the SSR function in hybrid mode, causing massive bundle size inflation
#168928d753b0 Thanks @astrobot-houston! - Fixes custom elements in MDX having their children's slot attribute stripped by the JSX runtime
When custom elements (tags with hyphens like <my-element>) are used in MDX files, the slot HTML attribute on their children is now correctly preserved. Previously, the shared JSX runtime would treat slot as an Astro slot assignment and remove it from the output, breaking Shadow DOM named slot distribution for web components.
#16957544ee76 Thanks @thelazylamaGit! - Fixes stale inline CSS in server-rendered HTML after CSS file edits during dev
When editing a CSS file (.css, .scss, etc.) during development, the inline <style> tags in server-rendered HTML would retain old CSS content instead of updating. This caused a brief flash of old CSS (FOUC) on fresh page loads before Vite's client-side HMR corrected the styles.
The fix ensures that Astro's per-route dev CSS virtual modules are invalidated in both the SSR module graph and the module runner's evaluation cache when a style file changes, so the next page render picks up the fresh CSS.
#170442220d22 Thanks @astrobot-houston! - Fixes CSS from client:only islands leaking to unrelated pages when Rollup bundles non-CSS-importing modules into the same chunk as CSS-importing modules
#16765b10e86e Thanks @fkatsuhiro! - Fixes an issue where renaming an image file while the dev server is running triggers a build error. Now Astro correctly hot-reloads the image without crashing.
#17026add3df1 Thanks @matthewp! - Hardens addAttribute to drop attribute names containing characters that are invalid per the HTML spec (", ', >, /, =, whitespace)
#17033ffda27b Thanks @matthewp! - Validates the request origin against allowedDomains before fetching prerendered error pages. When allowedDomains is configured and the Host header matches, the original origin is used. Otherwise, the fetch falls back to localhost.
#169854ecff32 Thanks @maximslo! - Fixes the experimental.logger destination not being used for the "Server listening on..." startup message. The logger is now resolved before the server starts listening, and adapterLogger re-creates itself when the underlying logger changes so the startup message uses the correct destination.
#16947e0703a6 Thanks @ematipico! - Fixes Astro.request.url not reflecting validated X-Forwarded-Proto/X-Forwarded-Host headers when security.allowedDomains is configured. Previously, only Astro.url was updated with the forwarded origin while Astro.request.url retained the socket-derived URL, causing the two to diverge behind TLS-terminating proxies.
#16997dc45246 Thanks @matthewp! - Reverts a change to isNode runtime detection that caused a significant build time regression for Cloudflare adapter users with large prerendered sites
#169261b39ae8 Thanks @narendraio! - Prevents App.match() from throwing on request paths that contain an invalid percent-sequence.
#169242c0bc94 Thanks @astrobot-houston! - Fixes an issue where editing a client-side component (e.g. with client:idle, client:load, etc.) caused an unnecessary full program reload of the backend during development.
#169582c1d50f Thanks @fkatsuhiro! - Fixes a bug where static file endpoints using getStaticPaths with .html in dynamic param values (e.g. { path: 'file.html' }) would fail with a NoMatchingStaticPathFound error during build. The .html suffix is no longer incorrectly stripped from endpoint route pathnames.
#16855c610cda Thanks @astrobot-houston! - Fixes dynamic routes returning 500 "TypeError: Missing parameter" when using domain-based i18n routing in SSR.
#16946606c37b Thanks @ematipico! - Fixes Astro.routePattern to preserve original casing of dynamic parameter names from filenames. Previously, a file at src/pages/blog/[postId].astro would return /blog/[postid] for Astro.routePattern due to an internal .toLowerCase() call. It now correctly returns /blog/[postId].
#1672016d49b6 Thanks @thomas-callahan-collibra! - Fix an issue where dynamic routes would return the string [object Object] instead of the expected content, in certain runtimes.
#1670317390a6 Thanks @henrybrewer00-dotcom! - Fixes styles being stripped when the project root is started with a path whose case differs from the actual filesystem case (e.g. running astro dev from d:\dev\app while the folder on disk is D:\dev\app).
#16855c610cda Thanks @astrobot-houston! - Fixes Astro.currentLocale returning the default locale instead of the domain's locale on dynamic routes served from a mapped domain.
#160160d85e1b Thanks @felmonon! - Fix a false positive in the dev toolbar accessibility audit for anchors with text inside closed <details> elements.
#1691179c6c46 Thanks @astrobot-houston! - Fixes a bug where experimental.advancedRouting with astro/hono handlers threw TypeError: Cannot read properties of undefined (reading 'route') for unmatched routes instead of rendering the custom 404 page.
#16899239c469 Thanks @matthewp! - Fixes a false "does not call the middleware() handler" warning when using astro() in a custom src/app.ts and the first request is a redirect route.
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changed the title
chore(astro): Update [DEV] minor & patch dependencies to ^6.4.6
chore(astro): Update [DEV] minor & patch dependencies to ^6.4.8
Jun 21, 2026
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This PR contains the following updates:
^6.0.0→^6.4.8Warning
Some dependencies could not be looked up. Check the Dependency Dashboard for more information.
Release Notes
withastro/astro (astro)
v6.4.8Compare Source
Patch Changes
27c80eaThanks @ematipico! - Harden the limits on the number of decoding on the URL.v6.4.7Compare Source
Patch Changes
#17035
197e50eThanks @astrobot-houston! - FixesgetRelativeLocaleUrl,getAbsoluteLocaleUrl, andgetAbsoluteLocaleUrlListto strip trailing slashes whentrailingSlash: 'never'is configured#16967
3719765Thanks @astrobot-houston! - Fixes double URL-encoded paths returning 400 Bad Request on on-demand routesPreviously, any URL containing a double-encoded character (like
%255B, which is[encoded twice) was unconditionally rejected with a400 Bad Requestbefore middleware or route handlers could run. This broke embedded tools like Sanity Studio whose client-side router legitimately produces double-encoded URLs.The fix replaces the rejection approach with iterative decoding — multi-level percent-encoding is now fully resolved to its canonical form before being passed to middleware and route matching. This preserves the security fix for CVE-2025-66202 (middleware authorization bypass via double encoding) because middleware now always sees the fully decoded path, making bypass impossible. For example,
/api/%2561dminis decoded to/api/admin, which middleware can correctly block.#17066
2f4d92aThanks @matthewp! - Fixes prerendered redirect targets being incorrectly bundled into the SSR function in hybrid mode, causing massive bundle size inflation#16882
621beb7Thanks @jettwayio! - fix(render): honour compressHTML when joining head elements#16892
8d753b0Thanks @astrobot-houston! - Fixes custom elements in MDX having their children'sslotattribute stripped by the JSX runtimeWhen custom elements (tags with hyphens like
<my-element>) are used in MDX files, theslotHTML attribute on their children is now correctly preserved. Previously, the shared JSX runtime would treatslotas an Astro slot assignment and remove it from the output, breaking Shadow DOM named slot distribution for web components.#16957
544ee76Thanks @thelazylamaGit! - Fixes stale inline CSS in server-rendered HTML after CSS file edits during devWhen editing a CSS file (
.css,.scss, etc.) during development, the inline<style>tags in server-rendered HTML would retain old CSS content instead of updating. This caused a brief flash of old CSS (FOUC) on fresh page loads before Vite's client-side HMR corrected the styles.The fix ensures that Astro's per-route dev CSS virtual modules are invalidated in both the SSR module graph and the module runner's evaluation cache when a style file changes, so the next page render picks up the fresh CSS.
#17044
2220d22Thanks @astrobot-houston! - Fixes CSS fromclient:onlyislands leaking to unrelated pages when Rollup bundles non-CSS-importing modules into the same chunk as CSS-importing modules#17040
7c4763dThanks @astrobot-houston! - Fixes HMR not triggering for files inside thesrc/middleware/directory during dev#16672
52fc862Thanks @martinheidegger! - Fixes support for numeric IDs in YAML frontmatter when using content collection references#16762
9de80aeThanks @alexanderdombroski! - Adds a JSON schema to the Wrangler configuration file generated when runningastro add cloudflare#17046
ef771ecThanks @ematipico! - Improves the diagnostics emitted when Astro parses incorrect.astrofiles.v6.4.6Compare Source
Patch Changes
#16765
b10e86eThanks @fkatsuhiro! - Fixes an issue where renaming an image file while the dev server is running triggers a build error. Now Astro correctly hot-reloads the image without crashing.#17026
add3df1Thanks @matthewp! - HardensaddAttributeto drop attribute names containing characters that are invalid per the HTML spec (",',>,/,=, whitespace)#17033
ffda27bThanks @matthewp! - Validates the request origin againstallowedDomainsbefore fetching prerendered error pages. WhenallowedDomainsis configured and the Host header matches, the original origin is used. Otherwise, the fetch falls back tolocalhost.v6.4.5Compare Source
Patch Changes
#16985
4ecff32Thanks @maximslo! - Fixes theexperimental.loggerdestination not being used for the "Server listening on..." startup message. The logger is now resolved before the server starts listening, andadapterLoggerre-creates itself when the underlying logger changes so the startup message uses the correct destination.#16947
e0703a6Thanks @ematipico! - FixesAstro.request.urlnot reflecting validatedX-Forwarded-Proto/X-Forwarded-Hostheaders whensecurity.allowedDomainsis configured. Previously, onlyAstro.urlwas updated with the forwarded origin whileAstro.request.urlretained the socket-derived URL, causing the two to diverge behind TLS-terminating proxies.#16997
dc45246Thanks @matthewp! - Reverts a change toisNoderuntime detection that caused a significant build time regression for Cloudflare adapter users with large prerendered sitesv6.4.4Compare Source
Patch Changes
#16926
1b39ae8Thanks @narendraio! - PreventsApp.match()from throwing on request paths that contain an invalid percent-sequence.#16924
2c0bc94Thanks @astrobot-houston! - Fixes an issue where editing a client-side component (e.g. withclient:idle,client:load, etc.) caused an unnecessary full program reload of the backend during development.#16958
2c1d50fThanks @fkatsuhiro! - Fixes a bug where static file endpoints usinggetStaticPathswith.htmlin dynamic param values (e.g.{ path: 'file.html' }) would fail with aNoMatchingStaticPathFounderror during build. The.htmlsuffix is no longer incorrectly stripped from endpoint route pathnames.#16855
c610cdaThanks @astrobot-houston! - Fixes dynamic routes returning 500 "TypeError: Missing parameter" when using domain-based i18n routing in SSR.#16946
606c37bThanks @ematipico! - FixesAstro.routePatternto preserve original casing of dynamic parameter names from filenames. Previously, a file atsrc/pages/blog/[postId].astrowould return/blog/[postid]forAstro.routePatterndue to an internal.toLowerCase()call. It now correctly returns/blog/[postId].#16720
16d49b6Thanks @thomas-callahan-collibra! - Fix an issue where dynamic routes would return the string[object Object]instead of the expected content, in certain runtimes.#16703
17390a6Thanks @henrybrewer00-dotcom! - Fixes styles being stripped when the project root is started with a path whose case differs from the actual filesystem case (e.g. runningastro devfromd:\dev\appwhile the folder on disk isD:\dev\app).#16855
c610cdaThanks @astrobot-houston! - FixesAstro.currentLocalereturning the default locale instead of the domain's locale on dynamic routes served from a mapped domain.v6.4.3Compare Source
Patch Changes
#16900
17a0fbdThanks @ocavue! - Bumpsdevaluedependency to v5.8.1#16016
0d85e1bThanks @felmonon! - Fix a false positive in the dev toolbar accessibility audit for anchors with text inside closed<details>elements.#16911
79c6c46Thanks @astrobot-houston! - Fixes a bug whereexperimental.advancedRoutingwithastro/honohandlers threwTypeError: Cannot read properties of undefined (reading 'route')for unmatched routes instead of rendering the custom 404 page.#16899
239c469Thanks @matthewp! - Fixes a false "does not call the middleware() handler" warning when usingastro()in a customsrc/app.tsand the first request is a redirect route.#16887
493acdbThanks @astrobot-houston! - FixesredirectToDefaultLocalenot working after the Advanced Routing refactoring.#16908
ef53ab9Thanks @florian-lefebvre! - Improves optimized fallbacks generation when using the Fonts API by using better metrics for bold variantsConfiguration
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