Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-29T16:45:57 undici: Undici: Cookie attribute injection allows bypassing security protections 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N CWE-140

undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.

A flaw was found in undici, where its `setCookie` function does not fully sanitize cookie attributes. A remote attacker could exploit this by providing specially crafted input to the `domain` or `unparsed` fields, leading to the injection of additional cookie attributes. This vulnerability can allow an attacker to bypass Cross-Site Request Forgery (CSRF) protections or manipulate critical cookie attributes like `Secure` and `HttpOnly`, potentially compromising user sessions or data integrity in applications such as multi-tenant or reverse-proxy servers.

Red Hat Hardened Images 2026-07-29T00:00:00Z RHSA-2026:48273 nodejs26-main-26.5.1-1.5.hum1 Red Hat Hardened Images 2026-07-30T00:00:00Z RHSA-2026:48537 nodejs24-main-24.18.1-0.1.hum1 Red Hat Hardened Images Not affected grafana12.4 Red Hat Hardened Images Not affected jaeger Red Hat Hardened Images Will not fix nodejs25 Red Hat Hardened Images Not affected prometheus3.13 Red Hat Hardened Images Not affected rust https://www.cve.org/CVERecord?id=CVE-2026-16729 https://nvd.nist.gov/vuln/detail/CVE-2026-16729 https://cna.openjsf.org/security-advisories.html https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm