8.3

CVE-2026-64649: vercel next.js Server-Side Request Forgery (SSRF)

CVSS: 8.3v4.0HighAnalyzed
AliasesCGA-4mjf-3g4c-vh9fCGA-4x78-9pxh-ggvgCGA-857x-557g-pc58
Published 27-07-2026Last modified 28-07-2026
Open JSON

Vulnerability summary

CVE-2026-64649 is a high (CVSS 8.3) Server-Side Request Forgery (SSRF) vulnerability in vercel next.js. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.7% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.46%
0%100%
Low · -0.41 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-8WP2-JHWQ-6W5H

Timeline

  1. 27-07-2026
    PublishedVulnerability first disclosed.
  2. 28-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

-0.41 pp

From 0.87% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.46%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard14 products
  • cadence-webAll versions (No fix recorded)
  • commercial-chainloop-frontendAll versions (No fix recorded)
  • homepage< 1.13.2-r9 | < 1.13.2-r8
  • jitsucom-jitsu-console< 2.11.0-r30
  • keep-ui< 0.54.2-r1
Wolfi4 products
  • jitsucom-jitsu-console< 2.11.0-r30
  • langfuse-3< 3.224.1-r0
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.224.1-r0
Npm1 product
  • next≥ 14.1.1, < 15.5.21 | ≥ 16.0.0, < 16.2.11
Vercel1 product
  • next.js≥ 16.0.0 < 16.2.11 (No fix recorded) | ≥ 14.1.1, < 15.5.21 | ≥ 16.0.0, < 16.2.11

4 vendors · 20 products

References

8 links