PT-2026-32979 · Npm · Next-Intl

Published 2026-04-10 · Updated 2026-04-18 · CVE-2026-40299

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions next-intl versions prior to 4.9.1

Description Applications using the middleware with localePrefix: 'as-needed' could construct URLs where path handling and the WHATWG URL parser resolved a relative redirect target to another host. This occurs through mechanisms such as scheme-relative // or control characters stripped by the URL parser, allowing the middleware to redirect the browser off-site from a trusted application URL.

Recommendations Update to version 4.9.1.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2026-40299

GHSA-8F24-V5VV-GM5J

Affected Products

Next-Intl

References · 9

• https://osv.dev/vulnerability/GHSA-8f24-v5vv-gm5j · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40299 · Security Note
• https://github.com/amannn/next-intl · Note
• https://github.com/amannn/next-intl/releases/tag/v4.9.1 · Note
• https://github.com/amannn/next-intl/security/advisories/GHSA-8f24-v5vv-gm5j · Note
• https://github.com/amannn/next-intl/pull/2304 · Note
• https://github.com/amannn/next-intl/commit/1c80b668aa6d853f470319eec10a3f61e78a70e6 · Note
• https://twitter.com/VulmonFeeds/status/2045275945557283302 · Twitter Post
• https://twitter.com/CVEnew/status/2045467395834167696 · Twitter Post