8.6

CVE-2026-44578: vercel next.js Server-Side Request Forgery (SSRF)

CVSS: 8.6v3.1HighModified
AliasesGHSA-c4j6-fc7j-m34rCGA-2cmr-jjmf-28m2CGA-85gj-42wc-74xg
Published 13-05-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-44578 is a high (CVSS 8.6) Server-Side Request Forgery (SSRF) vulnerability in vercel next.js. EPSS estimates a 1.90% chance of exploitation in the next 30 days, higher than 79.4% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v3.1 (CVE.org)
EPSS score
1.90%
0%100%
Low · -36.98 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-5Q48-XQJ7-3WC8

Timeline

  1. 13-05-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.90%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

-36.98 pp

From 38.87% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.90%

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

Chainguard4 products
  • cadence-webAll versions (No fix recorded)
  • commercial-chainloop-frontendAll versions (No fix recorded)
  • keep-ui< 0.51.0-r7
  • langfuse-fips-3.152All versions (No fix recorded)
Npm1 product
  • next≥ 13.4.13, < 15.5.16 | ≥ 16.0.0, < 16.2.5
Vercel1 product
  • next.js≥ 13.4.13, < 15.5.16 | ≥ 16.0.0, < 16.2.5

3 vendors · 6 products

References

13 links
Show all 13 references