CRLF injection in undici - CVE-2026-9679

Vulnerability identifier: #VU134756

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-9679

CWE-ID: CWE-93

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to inject arbitrary HTTP response headers.

The vulnerability exists due to improper neutralization of CRLF sequences in the parseSetCookie cookie parser when processing a crafted Set-Cookie header containing percent-encoded delimiter bytes. A remote attacker can supply a specially crafted upstream Set-Cookie header to inject arbitrary HTTP response headers.

Exploitation requires an application to parse a Set-Cookie header using parseSetCookie, parseCookie, or getSetCookies and then forward the parsed value into a downstream response header.

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 Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
openSUSE Leap
Fedora
Netezza Appliance
Maximo Application Suite - Visual Inspection Component
nodejs18-docs
nodejs18-debugsource
nodejs18-debuginfo
nodejs18
npm18
nodejs18-devel
corepack18
nodejs22
nodejs24

Install security update from vendor's website.

undici - addressed in versions 6.26.0, 7.28.0, 8.5.0
Netezza Appliance - update to 1.0.2.0
Maximo Application Suite - Visual Inspection Component - addressed in versions 9.0.22, 9.1.19, 9.2.1
nodejs18-docs - 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-debuginfo - 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
npm18 - addressed in versions 18.20.8-8.44.1, 18.20.8-150400.9.39.1
nodejs18-devel - 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
nodejs22 - update to 22.23.1-2.fc44
nodejs24 - update to 24.18.0-1.fc44

• https://github.com/nodejs/undici/security/advisories/GHSA-p88m-4jfj-68fv
• https://github.com/nodejs/undici/pull/3789

• Multiple vulnerabilities in undici
• Multiple vulnerabilities in IBM Maximo Application Suite - Visual Inspection Component
• Multiple vulnerabilities in IBM Netezza Appliance
• Fedora 44 update for nodejs24
• Fedora 44 update for nodejs22
• SUSE update for nodejs18
• SUSE update for nodejs18