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CVE-2026-44575

34
FAUCET Score

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 15.2.0, < 15.5.16CPE matchmatch criteria
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*
>= 16.0.0, < 16.2.5CPE matchmatch criteria
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.56%
Probability of exploitation in next 30 days
EPSS Percentile
72.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0156 is in the 54th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

npmpatch availablevia ghsa
Product: nextFixed in: 15.5.16
npmpatch availablevia ghsa
Product: nextFixed in: 16.2.5
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-267c-6grr-h53fhigh

Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes

May 11, 2026

References

access.redhat.com / errata/RHSA-2026:34608
access.redhat.com / errata/RHSA-2026:37272
access.redhat.com / errata/RHSA-2026:40974
access.redhat.com / security/cve/CVE-2026-44575
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-44575.json
github.com / vercel/next.js/security/advisories/GHSA-267c-6grr-h53f
Vendor Advisory