chore(deps): update vulnerabilities [security] (patch)#225
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This PR contains the following updates:
10.26.5→10.26.105.4.18→5.4.21GitHub Vulnerability Alerts
CVE-2026-22028
Impact
Vulnerability Type: HTML Injection via JSON Type Confusion
Affected Versions: Preact 10.26.5 through 10.28.1
Severity: Low to Medium (see below)
Who is Impacted?
Applications using affected Preact versions are vulnerable if they meet all of the following conditions:
Technical Details
Preact includes JSON serialization protection to prevent Virtual DOM elements from being constructed from arbitrary JSON. A regression introduced in Preact 10.26.5 caused this protection to be softened. In applications where values from JSON payloads are assumed to be strings and passed unmodified to Preact as children, a specially-crafted JSON payload could be constructed that would be incorrectly treated as a valid VNode. When this chain of failures occurs it can result in HTML injection, which can allow arbitrary script execution if not mitigated by CSP or other means.
Important Notes:
preact-render-to-stringPatches
Patched Versions:
Users should upgrade to the latest patch version of whatever minor version they are on, which can be done via
npm update preactor by installing one of the above versions directly.The patch versions simply restore the previous strict equality checks that prevent JSON-parsed objects from being treated as valid VNodes.
Mitigations
If you cannot upgrade immediately, implement the following mitigations:
References
Credits
Preact thanks YoungGeun Choi (Xvezda) for the responsible disclosure of this vulnerability and for providing detailed reproduction steps and proof-of-concept demonstrations.
Timeline
Recommendation: All users of Preact 10.26.5 through 10.28.1 should upgrade to the appropriate patched version (10.26.10, 10.27.3, or 10.28.2) as soon as possible, and review their applications for proper input validation and sanitization practices.
Preact has JSON VNode Injection issue
CVE-2026-22028 / GHSA-36hm-qxxp-pg3m
More information
Details
Impact
Vulnerability Type: HTML Injection via JSON Type Confusion
Affected Versions: Preact 10.26.5 through 10.28.1
Severity: Low to Medium (see below)
Who is Impacted?
Applications using affected Preact versions are vulnerable if they meet all of the following conditions:
Technical Details
Preact includes JSON serialization protection to prevent Virtual DOM elements from being constructed from arbitrary JSON. A regression introduced in Preact 10.26.5 caused this protection to be softened. In applications where values from JSON payloads are assumed to be strings and passed unmodified to Preact as children, a specially-crafted JSON payload could be constructed that would be incorrectly treated as a valid VNode. When this chain of failures occurs it can result in HTML injection, which can allow arbitrary script execution if not mitigated by CSP or other means.
Important Notes:
preact-render-to-stringPatches
Patched Versions:
Users should upgrade to the latest patch version of whatever minor version they are on, which can be done via
npm update preactor by installing one of the above versions directly.The patch versions simply restore the previous strict equality checks that prevent JSON-parsed objects from being treated as valid VNodes.
Mitigations
If you cannot upgrade immediately, implement the following mitigations:
References
Credits
Preact thanks YoungGeun Choi (Xvezda) for the responsible disclosure of this vulnerability and for providing detailed reproduction steps and proof-of-concept demonstrations.
Timeline
Recommendation: All users of Preact 10.26.5 through 10.28.1 should upgrade to the appropriate patched version (10.26.10, 10.27.3, or 10.28.2) as soon as possible, and review their applications for proper input validation and sanitization practices.
Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:UReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
CVE-2025-46565
Summary
The contents of files in the project
rootthat are denied by a file matching pattern can be returned to the browser.Impact
Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) are affected.
Only files that are under project
rootand are denied by a file matching pattern can be bypassed..env,.env.*,*.{crt,pem},**/.env**/.git/**,.git/**,.git/**/*Details
server.fs.denycan contain patterns matching against files (by default it includes.env,.env.*,*.{crt,pem}as such patterns).These patterns were able to bypass for files under
rootby using a combination of slash and dot (/.).PoC
CVE-2025-58752
Summary
Any HTML files on the machine were served regardless of the
server.fssettings.Impact
Only apps that match the following conditions are affected:
appType: 'spa'(default) orappType: 'mpa'is usedThis vulnerability also affects the preview server. The preview server allowed HTML files not under the output directory to be served.
Details
The serveStaticMiddleware function is in charge of serving static files from the server. It returns the viteServeStaticMiddleware function which runs the needed tests and serves the page. The viteServeStaticMiddleware function checks if the extension of the requested file is ".html". If so, it doesn't serve the page. Instead, the server will go on to the next middlewares, in this case htmlFallbackMiddleware, and then to indexHtmlMiddleware. These middlewares don't perform any test against allow or deny rules, and they don't make sure that the accessed file is in the root directory of the server. They just find the file and send back its contents to the client.
PoC
Execute the following shell commands:
Then, in a different shell, run the following command:
curl -v --path-as-is 'http://localhost:5173/../../../../../../../../../../../tmp/secret.html'The contents of /tmp/secret.html will be returned.
This will also work for HTML files that are in the root directory of the project, but are in the deny list (or not in the allow list). Test that by stopping the running server (CTRL+C), and running the following commands in the server's shell:
Then, in a different shell, run the following command:
curl -v --path-as-is 'http://localhost:5173/secret_files/secret.txt'You will receive a 403 HTTP Response, because everything in the secret_files directory is denied.
Now in the same shell run the following command:
curl -v --path-as-is 'http://localhost:5173/secret_files/secret.html'You will receive the contents of secret_files/secret.html.
CVE-2025-58751
Summary
Files starting with the same name with the public directory were served bypassing the
server.fssettings.Impact
Only apps that match the following conditions are affected:
server.hostconfig option)Details
The servePublicMiddleware function is in charge of serving public files from the server. It returns the viteServePublicMiddleware function which runs the needed tests and serves the page. The viteServePublicMiddleware function checks if the publicFiles variable is defined, and then uses it to determine if the requested page is public. In the case that the publicFiles is undefined, the code will treat the requested page as a public page, and go on with the serving function. publicFiles may be undefined if there is a symbolic link anywhere inside the public directory. In that case, every requested page will be passed to the public serving function. The serving function is based on the sirv library. Vite patches the library to add the possibility to test loading access to pages, but when the public page middleware disables this functionality since public pages are meant to be available always, regardless of whether they are in the allow or deny list.
In the case of public pages, the serving function is provided with the path to the public directory as a root directory. The code of the sirv library uses the join function to get the full path to the requested file. For example, if the public directory is "/www/public", and the requested file is "myfile", the code will join them to the string "/www/public/myfile". The code will then pass this string to the normalize function. Afterwards, the code will use the string's startsWith function to determine whether the created path is within the given directory or not. Only if it is, it will be served.
Since sirv trims the trailing slash of the public directory, the string's startsWith function may return true even if the created path is not within the public directory. For example, if the server's root is at "/www", and the public directory is at "/www/p", if the created path will be "/www/private.txt", the startsWith function will still return true, because the string "/www/private.txt" starts with "/www/p". To achieve this, the attacker will use ".." to ask for the file "../private.txt". The code will then join it to the "/www/p" string, and will receive "/www/p/../private.txt". Then, the normalize function will return "/www/private.txt", which will then be passed to the startsWith function, which will return true, and the processing of the page will continue without checking the deny list (since this is the public directory middleware which doesn't check that).
PoC
Execute the following shell commands:
Then, in a different shell, run the following command:
curl -v --path-as-is 'http://localhost:5173/private.txt'You will receive a 403 HTTP Response, because private.txt is denied.
Now in the same shell run the following command:
curl -v --path-as-is 'http://localhost:5173/../private.txt'You will receive the contents of private.txt.
Related links
CVE-2025-62522
Summary
Files denied by
server.fs.denywere sent if the URL ended with\when the dev server is running on Windows.Impact
Only apps that match the following conditions are affected:
server.hostconfig option)Details
server.fs.denycan contain patterns matching against files (by default it includes.env,.env.*,*.{crt,pem}as such patterns). These patterns were able to bypass by using a back slash(\). The root cause is thatfs.readFile('/foo.png/')loads/foo.png.PoC
Vite's server.fs.deny bypassed with /. for files under project root
CVE-2025-46565 / GHSA-859w-5945-r5v3
More information
Details
Summary
The contents of files in the project
rootthat are denied by a file matching pattern can be returned to the browser.Impact
Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) are affected.
Only files that are under project
rootand are denied by a file matching pattern can be bypassed..env,.env.*,*.{crt,pem},**/.env**/.git/**,.git/**,.git/**/*Details
server.fs.denycan contain patterns matching against files (by default it includes.env,.env.*,*.{crt,pem}as such patterns).These patterns were able to bypass for files under
rootby using a combination of slash and dot (/.).PoC
Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Vite's
server.fssettings were not applied to HTML filesCVE-2025-58752 / GHSA-jqfw-vq24-v9c3
More information
Details
Summary
Any HTML files on the machine were served regardless of the
server.fssettings.Impact
Only apps that match the following conditions are affected:
appType: 'spa'(default) orappType: 'mpa'is usedThis vulnerability also affects the preview server. The preview server allowed HTML files not under the output directory to be served.
Details
The serveStaticMiddleware function is in charge of serving static files from the server. It returns the viteServeStaticMiddleware function which runs the needed tests and serves the page. The viteServeStaticMiddleware function checks if the extension of the requested file is ".html". If so, it doesn't serve the page. Instead, the server will go on to the next middlewares, in this case htmlFallbackMiddleware, and then to indexHtmlMiddleware. These middlewares don't perform any test against allow or deny rules, and they don't make sure that the accessed file is in the root directory of the server. They just find the file and send back its contents to the client.
PoC
Execute the following shell commands:
Then, in a different shell, run the following command:
curl -v --path-as-is 'http://localhost:5173/../../../../../../../../../../../tmp/secret.html'The contents of /tmp/secret.html will be returned.
This will also work for HTML files that are in the root directory of the project, but are in the deny list (or not in the allow list). Test that by stopping the running server (CTRL+C), and running the following commands in the server's shell:
Then, in a different shell, run the following command:
curl -v --path-as-is 'http://localhost:5173/secret_files/secret.txt'You will receive a 403 HTTP Response, because everything in the secret_files directory is denied.
Now in the same shell run the following command:
curl -v --path-as-is 'http://localhost:5173/secret_files/secret.html'You will receive the contents of secret_files/secret.html.
Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Vite middleware may serve files starting with the same name with the public directory
CVE-2025-58751 / GHSA-g4jq-h2w9-997c
More information
Details
Summary
Files starting with the same name with the public directory were served bypassing the
server.fssettings.Impact
Only apps that match the following conditions are affected:
server.hostconfig option)Details
The servePublicMiddleware function is in charge of serving public files from the server. It returns the viteServePublicMiddleware function which runs the needed tests and serves the page. The viteServePublicMiddleware function checks if the publicFiles variable is defined, and then uses it to determine if the requested page is public. In the case that the publicFiles is undefined, the code will treat the requested page as a public page, and go on with the serving function. publicFiles may be undefined if there is a symbolic link anywhere inside the public directory. In that case, every requested page will be passed to the public serving function. The serving function is based on the sirv library. Vite patches the library to add the possibility to test loading access to pages, but when the public page middleware disables this functionality since public pages are meant to be available always, regardless of whether they are in the allow or deny list.
In the case of public pages, the serving function is provided with the path to the public directory as a root directory. The code of the sirv library uses the join function to get the full path to the requested file. For example, if the public directory is "/www/public", and the requested file is "myfile", the code will join them to the string "/www/public/myfile". The code will then pass this string to the normalize function. Afterwards, the code will use the string's startsWith function to determine whether the created path is within the given directory or not. Only if it is, it will be served.
Since sirv trims the trailing slash of the public directory, the string's startsWith function may return true even if the created path is not within the public directory. For example, if the server's root is at "/www", and the public directory is at "/www/p", if the created path will be "/www/private.txt", the startsWith function will still return true, because the string "/www/private.txt" starts with "/www/p". To achieve this, the attacker will use ".." to ask for the file "../private.txt". The code will then join it to the "/www/p" string, and will receive "/www/p/../private.txt". Then, the normalize function will return "/www/private.txt", which will then be passed to the startsWith function, which will return true, and the processing of the page will continue without checking the deny list (since this is the public directory middleware which doesn't check that).
PoC
Execute the following shell commands:
Then, in a different shell, run the following command:
curl -v --path-as-is 'http://localhost:5173/private.txt'You will receive a 403 HTTP Response, because private.txt is denied.
Now in the same shell run the following command:
curl -v --path-as-is 'http://localhost:5173/../private.txt'You will receive the contents of private.txt.
Related links
Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
vite allows server.fs.deny bypass via backslash on Windows
CVE-2025-62522 / GHSA-93m4-6634-74q7
More information
Details
Summary
Files denied by
server.fs.denywere sent if the URL ended with\when the dev server is running on Windows.Impact
Only apps that match the following conditions are affected:
server.hostconfig option)Details
server.fs.denycan contain patterns matching against files (by default it includes.env,.env.*,*.{crt,pem}as such patterns). These patterns were able to bypass by using a back slash(\). The root cause is thatfs.readFile('/foo.png/')loads/foo.png.PoC
Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
preactjs/preact (preact)
v10.26.10Compare Source
Fixes
v10.26.9Compare Source
Fixes
test-utilsfrom compat by @rawrmonstar in #4783styleobject value inprecompiletransform by @marvinhagemeister in #4795precompiletransform by @marvinhagemeister in #4798Maintenance
browserslistby @rschristian in #4785v10.26.8Compare Source
Fixes
v10.26.7Compare Source
Types
nameto<details>(#4766, thanks @marvinhagemeister)Improvements
Maintenance
v10.26.6Compare Source
Fixes
Types
HTMLMediaElement.controlsListtype to string (DOMTokenList) (#4744, thanks @piotr-cz)Maintenance
vitejs/vite (vite)
v5.4.21Compare Source
Please refer to CHANGELOG.md for details.
v5.4.20Compare Source
Please refer to CHANGELOG.md for details.
v5.4.19Compare Source
Please refer to CHANGELOG.md for details.
Configuration
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