- Description
- Next.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery). This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization. Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host. Managed hosting pins the host upstream and is not affected; next start and standalone output do the same from version 14.2 onward. This issue has been fixed in versions 15.5.21 and 16.2.11.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
- Products
- next.js
CVSS 4.0
- Type
- Secondary
- Base score
- 8.3
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- HIGH
CVSS 3.1
- Type
- Primary
- Base score
- 6.5
- Impact score
- 2.5
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Severity
- MEDIUM
- security-advisories@github.com
- CWE-918
- Hype score
- Not currently trending
一気に9件は、ちょっとフロンティアAI頑張りすぎなのでは。 Next.jsでHigh 4件、Medium 5件が修正された。CVE-2026-64641のServer Actions経由DoS、CVE-2026-64642のMiddleware／Proxy認証回避、CVE-2026-64645とCVE-2026-64649のSSRFを含む。
@connect24h
29 Jul 2026
301 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Next.jsで9件の脆弱性が修正。最も深刻なのはCVE-2026-64645で、CVSSスコア8.3。攻撃者制御下のホストを宛先ホスト名とするrewrites発現。ほか、SSRFのCVE-2026-64649やApp Routerでのプロキシ回避CVE-2026-64642等。 https://t.co/HzZM
@__kokumoto
23 Jul 2026
435 Impressions
0 Retweets
2 Likes
1 Bookmark
0 Replies
0 Quotes
Three Next.js vulnerabilities (CVE-2026-64645, CVE-2026-64649, CVE-2026-64642) enable Server-Side Request Forgery and middleware bypass. Patch now. #Nextjs #SSRF #CVE202664645 #WebSecurity #Vercel https://t.co/qMNXEoAOlm
@Daily_CyberSec
23 Jul 2026
375 Impressions
0 Retweets
1 Like
0 Bookmarks
0 Replies
0 Quotes
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