⬆️(dependencies) update next to v15.5.15 [SECURITY]#9
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This PR contains the following updates:
15.3.2→15.5.15Next.js is vulnerable to RCE in React flight protocol
GHSA-9qr9-h5gf-34mp
More information
Details
A vulnerability affects certain React packages1 for versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 and frameworks that use the affected packages, including Next.js 15.x and 16.x using the App Router. The issue is tracked upstream as CVE-2025-55182.
Fixed in:
React: 19.0.1, 19.1.2, 19.2.1
Next.js: 15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7, 15.6.0-canary.58, 16.1.0-canary.12+
The vulnerability also affects experimental canary releases starting with 14.3.0-canary.77. Users on any of the 14.3 canary builds should either downgrade to a 14.x stable release or 14.3.0-canary.76.
All users of stable 15.x or 16.x Next.js versions should upgrade to a patched, stable version immediately.
1 The affected React packages are:
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next Server Actions Source Code Exposure
GHSA-w37m-7fhw-fmv9
More information
Details
A vulnerability affects certain React packages for versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0, and 19.2.1 and frameworks that use the affected packages, including Next.js 15.x and 16.x using the App Router. The issue is tracked upstream as CVE-2025-55183.
A malicious HTTP request can be crafted and sent to any App Router endpoint that can return the compiled source code of Server Functions. This could reveal business logic, but would not expose secrets unless they were hardcoded directly into Server Function code.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next Vulnerable to Denial of Service with Server Components
GHSA-mwv6-3258-q52c
More information
Details
A vulnerability affects certain React packages for versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0, and 19.2.1 and frameworks that use the affected packages, including Next.js 15.x and 16.x using the App Router. The issue is tracked upstream as CVE-2025-55184.
A malicious HTTP request can be crafted and sent to any App Router endpoint that, when deserialized, can cause the server process to hang and consume CPU. This can result in denial of service in unpatched environments.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next.js HTTP request deserialization can lead to DoS when using insecure React Server Components
GHSA-h25m-26qc-wcjf
More information
Details
A vulnerability affects certain React Server Components packages for versions 19.0.x, 19.1.x, and 19.2.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23864.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage, out-of-memory exceptions, or server crashes. This can result in denial of service in unpatched environments.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next.js self-hosted applications vulnerable to DoS via Image Optimizer remotePatterns configuration
CVE-2025-59471 / GHSA-9g9p-9gw9-jx7f
More information
Details
A DoS vulnerability exists in self-hosted Next.js applications that have
remotePatternsconfigured for the Image Optimizer. The image optimization endpoint (/_next/image) loads external images entirely into memory without enforcing a maximum size limit, allowing an attacker to cause out-of-memory conditions by requesting optimization of arbitrarily large images. This vulnerability requires thatremotePatternsis configured to allow image optimization from external domains and that the attacker can serve or control a large image on an allowed domain.Strongly consider upgrading to 15.5.10 and 16.1.5 to reduce risk and prevent availability issues in Next applications.
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next.js: HTTP request smuggling in rewrites
CVE-2026-29057 / GHSA-ggv3-7p47-pfv8
More information
Details
Summary
When Next.js rewrites proxy traffic to an external backend, a crafted
DELETE/OPTIONSrequest usingTransfer-Encoding: chunkedcould trigger request boundary disagreement between the proxy and backend. This could allow request smuggling through rewritten routes.Impact
An attacker could smuggle a second request to unintended backend routes (for example, internal/admin endpoints), bypassing assumptions that only the configured rewrite destination/path is reachable. This does not impact applications hosted on providers that handle rewrites at the CDN level, such as Vercel.
Patches
The vulnerability originated in an upstream library vendored by Next.js. It is fixed by updating that dependency’s behavior so
content-length: 0is added only when bothcontent-lengthandtransfer-encodingare absent, andtransfer-encodingis no longer removed in that code path.Workarounds
If upgrade is not immediately possible:
DELETE/OPTIONSrequests on rewritten routes at your edge/proxy.Severity
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next.js: Unbounded next/image disk cache growth can exhaust storage
CVE-2026-27980 / GHSA-3x4c-7xq6-9pq8
More information
Details
Summary
The default Next.js image optimization disk cache (
/_next/image) did not have a configurable upper bound, allowing unbounded cache growth.Impact
An attacker could generate many unique image-optimization variants and exhaust disk space, causing denial of service. Note that this does not impact platforms that have their own image optimization capabilities, such as Vercel.
Patches
Fixed by adding an LRU-backed disk cache with
images.maximumDiskCacheSize, including eviction of least-recently-used entries when the limit is exceeded. SettingmaximumDiskCacheSize: 0disables disk caching.Workarounds
If upgrade is not immediately possible:
.next/cache/images.images.localPatterns,images.remotePatterns, andimages.qualities)Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Next.js has a Denial of Service with Server Components
GHSA-q4gf-8mx6-v5v3
More information
Details
A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23869. You can read more about this advisory our this changelog.
A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
vercel/next.js (next)
v15.5.15Compare Source
Please refer the following changelogs for more information about this security release:
https://vercel.com/changelog/summary-of-cve-2026-23869
v15.5.14Compare Source
v15.5.13Compare Source
v15.5.12Compare Source
This is a re-release of v15.5.11 applying the turbopack changes.
v15.5.11Compare Source
Core Changes
Credits
Huge thanks to @timneutkens, @mischnic, @ztanner, and @wyattjoh for helping!
v15.5.10Compare Source
Please refer the following changelogs for more information about this security release:
v15.5.9Compare Source
v15.5.8Compare Source
v15.5.7Compare Source
v15.5.6Compare Source
Core Changes
Credits
Huge thanks to @mischnic for helping!
v15.5.5Compare Source
Core Changes
experimental.middlewareClientMaxBodySizebody cloning limit (#84722)Misc Changes
Credits
Huge thanks to @devjiwonchoi, @ztanner, and @icyJoseph for helping!
v15.5.4Compare Source
Core Changes
Misc Changes
Credits
Huge thanks to @yiminghe, @huozhi, @devjiwonchoi, @mischnic, @lukesandberg, @ztanner, @icyJoseph, @leerob, @fufuShih, @dwrth, @aymericzip, @obendev, @molebox, @OoMNoO, @pontasan, @styfle, @HondaYt, @ryuapp, @lpalmes, and @ijjk for helping!
v15.5.3Compare Source
Core Changes
Credits
Huge thanks to @bgub for helping!
v15.5.2Compare Source
Core Changes
Credits
Huge thanks to @bgub and @ztanner for helping!
v15.5.1Compare Source
Core Changes
Credits
Huge thanks to @bgub, @mischnic, and @ztanner for helping!
v15.5.0Compare Source
Core Changes
@typescript-eslint/switch-exhaustiveness-checkrule: #81583React.unstable_postpone(): #81652images.qualitiesis undefined: #81690pprordynamicIOenabled: #81668__turbopack_load_by_url__: #8166397cdd5d3-20250710to2f0e7e57-20250715: #81678renderToStringfunction: #817072f0e7e57-20250715tod85ec5f5-20250716: #81708next-serverVM: #81664headers/cookies/draftModein'use cache': #81716d85ec5f5-20250716todffacc7b-20250717: #81767getExpectedRequestStorefunction: #81791.next/cache: #81807dffacc7b-20250717toe9638c33-20250721: #81899'use cache: private': #81816browserslist: #81851run-turbopack-compilertrace span: #81917e9638c33-20250721to7513996f-20250722: #819407513996f-20250722toedac0dde-20250723: #81984exhaustive-depsviolations: #82010edac0dde-20250723to3d14fcf0-20250724: #820203d14fcf0-20250724to19baee81-20250725: #8206319baee81-20250725toeaee5308-20250728: #82120eaee5308-20250728to9be531cd-20250729: #82159@next/codemod: update docs url in README: #82135@next/codemod: Addexperimental.turbototurbopackcodemod for Next.js configs: #82134NextRequesttypes: #821729be531cd-20250729to9784cb37-20250730: #82207TURBOPACKenv before loading config: #82162outputFileTracingRootorturbopack.rootoption is provided: #821649784cb37-20250730toc260b38d-20250731: #82247eslint-plugin-react-hooksin React sync: #82294c260b38d-20250731tobe11cb5c-20250804: #82339_errorpage'sreq.urlcan be overwritten to dynamic param on minimal mode: #82347asPathfor query-only navigation withuseRouter: #82236?dplto fonts in/_next/static/media: #82384be11cb5c-20250804to7deda941-20250804: #82373pathto Image documentation: #823297deda941-20250804to3958d5d8-20250807: #824473958d5d8-20250807tof1e70b5e-20250811: #82534f1e70b5e-20250811toac7820a9-20250811: #82543image-sizepkg as additional format detector: #82538?dplto fonts in/_next/static/mediapart 2: #82488componentStackFramesfield: #82395skipMetadata: #82569ac7820a9-20250811to1dc3bdea-20250812: #82575Mapsupport fromnext/dynamictransform: #82487window.next.turbopackinstead: #825801dc3bdea-20250812tof1222f76-20250812: #82595Configuration
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