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CVE-2026-64646

Next.js: Unbounded Server Action payload in Edge runtime

MEDIUM
5.3
CVSS Score
Published: July 27, 2026 at 06:54 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
1 product affected across 1 vendorNext.js

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive memory consumption if that Server Actions uses the Edge runtime. This issue has been fixed in versions 15.5.21 and 16.2.11.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Next.js· Vercelnpm
95%
13.0.0 ≤ v < 15.5.2116.0.0 ≤ v < 16.2.11
Affected range stops below 15.5.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.2.11, so it looks safe — our inference, not a vendor statement

References (5)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4
x_refsource_MISCPatch
Source: [email protected]
https://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17
x_refsource_MISCProductRelease Notes
Source: [email protected]
https://github.com/vercel/next.js/releases/tag/v15.5.21
x_refsource_MISCProductRelease Notes
Source: [email protected]
https://github.com/vercel/next.js/releases/tag/v16.2.11
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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