Improper Neutralization of Special Elements in Output Used by a Downstream Component in undici - CVE-2026-16729

Vulnerability identifier: #VU140036

CSH Severity: Medium

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-16729

CWE-ID: CWE-74

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass cookie security protections and modify cookie attributes.

The vulnerability exists due to improper neutralization of special elements in output used by a downstream component in the setCookie function when processing user-controlled domain or unparsed setCookie fields. A remote attacker can supply crafted input containing cookie attributes to bypass cookie security protections and modify cookie attributes.

Exploitation requires an application to pass user-controlled input to these fields, such as in multi-tenant or reverse-proxy deployments.

undici
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
openSUSE Leap
IBM Maximo Application Suite
IBM App Connect Enterprise
Netezza Appliance - Cyclops
Informix Dynamic Server
nodejs18-devel
npm18
nodejs18
nodejs18-debuginfo
nodejs18-debugsource
nodejs18-docs
corepack18

Install security update from vendor's website.

undici - addressed in versions 6.28.0, 7.29.0, 8.9.0
IBM Maximo Application Suite - addressed in versions 9.0.29, 9.1.21, 9.2.2
IBM App Connect Enterprise - update to 13.0.9.0
Netezza Appliance - Cyclops - update to 11.3.1.4
Informix Dynamic Server - addressed in versions 14.10.FC14W1, 15.0.1.16
nodejs18-devel - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
npm18 - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
nodejs18 - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
nodejs18-debuginfo - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
nodejs18-debugsource - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
nodejs18-docs - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
corepack18 - update to 18.20.8-150400.9.39.1

• https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm

• Multiple vulnerabilities in undici
• Multiple vulnerabilities in IBM Maximo Application Suite
• Multiple vulnerabilities in IBM Netezza Appliance - Cyclops
• Multiple vulnerabilities in IBM Informix Dynamic Server
• SUSE update for nodejs18
• SUSE update for nodejs18
• Multiple vulnerabilities in IBM App Connect Enterprise