VulnSocial

CVE-2026-45109Disclosure(vercel / next.js)

LOWCVSS 7.5 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Patch vercel next.js systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-288CWE-358

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • next.js

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked at 2 mentions on most recent observed day (2026-05-15)
  • 3 total mentions across 2 days

Affected systems

Vendors
vercel
Products
next.js

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-05-11: 1Mentions · 2026-05-15: 2Patch / Workaround · 2026-05-11: 1Technical Details · 2026-05-11: 1Technical Details · 2026-05-15: 205-1105-15
Signal classification1 categories
Disclosure
3100.0%
Referenced assets1 URL
By indicator
Classification over time
DateTotalLabels
2026-05-111
Disclosure1
2026-05-152
Disclosure2
Full discourse3 posts
  • Upwind Security MDR@UpwindMDR
    Disclosure

    🚨 High - Next.js Multiple Vulnerabilities (CVE-2026-44573, CVE-2026-44574, CVE-2026-44575, CVE-2026-44578, CVE-2026-44579, CVE-2026-45109) Multiple issues were identified in Next.js affecting App Router, Pages Router, Server Components, WebSockets, and caching mechanisms. These include middleware/proxy bypasses, denial of service via connection exhaustion, and potential SSRF via WebSocket upgrade handling. 👉 Affected: next (npm) | Fix: Monitor vendor advisories and upgrade to patched versions

    Post summary

    The tweet announces the discovery of multiple high‑severity vulnerabilities in Next.js, providing technical details and recommending that users monitor vendor advisories and upgrade to patched versions.

    10030283
    187 followersView on X
  • selva@SelvaKtm2
    Disclosure

    Next.js CVE-2026-45109: Turbopack Middleware Auth Bypass Flaw https://thecybrdef.com/nextjs-cve-2026-45109-turbopack-auth-bypass/ #Cyberupdates #Cybertechnews #Cybersecurity

    Post summary

    Announcement of an authentication bypass issue in Turbopack middleware (CVE-2026-45109) with a brief description.

    0000040
    5 followersView on X
  • cybersecuritypath@cybrsecpath
    Disclosure

    Next.js CVE-2026-45109: Turbopack Middleware Auth Bypass Flaw https://thecybrdef.com/nextjs-cve-2026-45109-turbopack-auth-bypass/ #Cyberupdates #Cybertechnews #Cybersecurity

    Post summary

    The tweet shares a link to an article announcing CVE‑2026‑45109, a middleware authentication bypass flaw in Next.js's Turbopack, without detailing PoCs, exploits, patches, or active exploitation.

    0000047
    9 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appvercelnext.js-node.js-

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