GHSA-c4j6-fc7j-m34r: next (CVE-2026-44578)

Next.js vulnerable to server-side request forgery in applications using WebSocket upgrades

CVSS 8.6 HighCriticalEPSS 0.36 · 98th percentile

Critical, because:

CVSS score 8.6 (7.0 or more) and EPSS 0.36 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the GitHub Advisory Database at 11 May 2026, 15:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
next	npm	>=13.4.13, <15.5.16 \|\| >=16.0.0, <16.2.5	15.5.16, 16.2.5

Identifiers

GHSA-c4j6-fc7j-m34r · CVE-2026-44578

Weakness (CWE)

CWE-918

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.6	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.36, the 98th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

6 May 2026, 18:43 UTC Published by the maintainers as a GitHub repository advisory

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.