Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| undici | undici | < 6.28.0, 7.0.0 – < 7.29.0, 8.0.0 – < 8.9.0 | 6.28.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-undici | 8.9.0+dfsg+~cs3.2.0-1 | — |
| Debian 13 | node-undici | No fix yet | — |
| Debian 12 | node-undici | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-undici | No fix yet | — |
| Ubuntu 26.04 LTS | node-undici | No fix yet | — |
| Ubuntu 24.04 LTS | node-undici | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | nodejs24 +6 | 24.18.1-0.1.hum1 | RHSA-2026:48537 |
| Red Hat Hardened Images 1 | nodejs24-npm | 11.16.0-1.24.18.1.0.1.hum1 | RHSA-2026:48537 |
| Red Hat Hardened Images 1 | nodejs26 +6 | 26.5.1-1.5.hum1 | RHSA-2026:48273 |
| Red Hat Hardened Images 1 | nodejs26-npm | 11.17.0-1.26.5.1.1.5.hum1 | RHSA-2026:48273 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | nodejs20 | 20.20.2-150600.3.21.1 | SUSE-SU-2026:3929-1 |
| SLES 15 SP5 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES 15 SP5 | nodejs20 | 20.20.2-150500.11.30.1 | SUSE-SU-2026:3930-1 |
| SLES 15 SP4 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES 12 SP5 | nodejs18 | 18.20.8-8.44.1 | SUSE-SU-2026:4248-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | nodejs20 | 20.20.2-150600.3.21.1 | SUSE-SU-2026:3929-1 |
| SLES for SAP 15 SP5 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLES for SAP 15 SP5 | nodejs20 | 20.20.2-150500.11.30.1 | SUSE-SU-2026:3930-1 |
| SLES for SAP 15 SP4 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLE HPC 15 SP5 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
| SLE HPC 15 SP5 | nodejs20 | 20.20.2-150500.11.30.1 | SUSE-SU-2026:3930-1 |
| SLE HPC 15 SP4 | nodejs18 | 18.20.8-150400.9.39.1 | SUSE-SU-2026:4261-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | nodejs22 +4 | 1:22.23.2-1.amzn2023.0.2 | ALAS2023-2026-2060 |
| Amazon Linux 2023 | nodejs22-npm | 1:10.9.8-1.22.23.2.1.amzn2023.0.2 | ALAS2023-2026-2060 |
| Amazon Linux 2023 | nodejs24 +4 | 1:24.18.1-1.amzn2023.0.2 | ALAS2023-2026-2059 |
| Amazon Linux 2023 | nodejs24-npm | 1:11.16.0-1.24.18.1.1.amzn2023.0.2 | ALAS2023-2026-2059 |
| Amazon Linux 2023 | v8-12.4-devel | 3:12.4.254.21-1.22.23.2.1.amzn2023.0.2 | ALAS2023-2026-2060 |
| Amazon Linux 2023 | v8-13.6-devel | 3:13.6.233.17-1.24.18.1.1.amzn2023.0.2 | ALAS2023-2026-2059 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | nodejs | 24.22.0-1 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | code-server | 4.130.0-r5 | — |
| Wolfi rolling | langfuse-3 +1 | 3.225.0-r3 | — |
| Wolfi rolling | langfuse-3-compat | 3.225.7-r6 | — |
| Wolfi rolling | npm-12 | 12.0.2-r2 | — |
| Wolfi rolling | prism | 5.16.0-r2 | — |
| Wolfi rolling | pulumi-language-nodejs | 3.256.0-r1 | — |
| Wolfi rolling | renovate | 44.11.3-r0 | — |
| Wolfi rolling | saf | 1.7.0-r0 | — |
| Wolfi rolling | vitess-24 | 24.0.2-r10 | — |
| Wolfi rolling | vitess-24-compat | 24.0.3-r7 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | undici | < 6.28.0 | 6.28.0 | GHSA-v3r7-h72x-cjcm |
| npm | undici | >= 7.0.0, < 7.29.0 | 7.29.0 | GHSA-v3r7-h72x-cjcm |
| npm | undici | >= 8.0.0, < 8.9.0 | 8.9.0 | GHSA-v3r7-h72x-cjcm |
Advisories 10
- WID-SEC-2026-3596 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- WID-SEC-2026-3621 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- RHSA-2026:48537 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:48273 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SUSE-SU-2026:4261-1 Security update for nodejs18 SUSE / openSUSE Security Updates · Sep 18, 2026
- SUSE-SU-2026:4248-1 Security update for nodejs18 SUSE / openSUSE Security Updates · Sep 18, 2026
- SUSE-SU-2026:3929-1 Security update for nodejs20 SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:3930-1 Security update for nodejs20 SUSE / openSUSE Security Updates · Sep 10, 2026
- ALAS2023-2026-2059 Important: nodejs24 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 21, 2026
- ALAS2023-2026-2060 Important: nodejs22 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 17, 2026