CVE catalog
CVE-2026-11525
Impact: When undici parses a Set-Cookie header, it accepts any SameSite attribute value that contains Strict, Lax, or None as a substring, rather than the case-insensitive exact match specified by RFC
- Severity
- Low · CVSS 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.24% · Oct 25, 2026
Impact: When undici parses a Set-Cookie header, it accepts any SameSite attribute value that contains Strict, Lax, or None as a substring, rather than the case-insensitive exact match specified by RFC 6265. Non-spec values are silently mapped to one of the three standard tokens. For example, SameSite=NoneOfYourBusiness is parsed as None (the most permissive setting), and SameSite=StrictLax is parsed as Lax (a downgrade from Strict). Affected applications are those that consume Set-Cookie headers from server responses (for example via undici's fetch or proxy code paths) and then forward or rely on the parsed sameSite attribute. A malicious or non-compliant server can coerce the consumer's view of a cookie's SameSite policy to a weaker value, silently degrading the SameSite enforcement the cookie is supposed to provide. This was introduced in undici 5.15.0 when the cookies feature was added. Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0. Workarounds: After parsing a Set-Cookie header, validate that the resulting sameSite attribute is one of 'Strict', 'Lax', or 'None' (exact, case-insensitive) before forwarding or relying on it.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | node-undici | sid | 8.12.2+dfsg+~cs3.2.3-2 | fixed |
| Debian | node-undici | forky | 8.10.2+dfsg+~cs3.2.2-1 | fixed |
| Debian | node-undici | trixie | 7.3.0+dfsg1+~cs24.12.11-1 | vulnerable |
| Debian | node-undici | bookworm | 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 | vulnerable |
| Debian | node-undici | bookworm-security | 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 | vulnerable |
| Cpe | node-undici | Not reported | Not reported | vulnerable |
| Cpe | undici | Not reported | 6.27.0 | fixed |
| Cpe | undici | Not reported | 7.28.0 | fixed |
| Cpe | undici | Not reported | 8.5.0 | fixed |
| Suse | nodejs24 | linux enterprise server 16.0 | 24.18.0-160000.1.1 | fixed |
| Suse | nodejs24 | linux enterprise server for sap applications 16.0 | 24.18.0-160000.1.1 | fixed |
| Opensuse | nodejs24 | leap 16.0 | 24.18.0-160000.1.1 | fixed |
| Suse | nodejs22 | linux enterprise server 16.0 | 22.23.0-160000.1.1 | fixed |
| Suse | nodejs22 | linux enterprise server for sap applications 16.0 | 22.23.0-160000.1.1 | fixed |
| Suse | nodejs22 | linux enterprise module for web and scripting 15 sp7 | 22.23.0-150700.3.12.1 | fixed |
| Opensuse | nodejs22 | leap 16.0 | 22.23.0-160000.1.1 | fixed |
| Suse | nodejs22 | linux enterprise server 15 sp6-ltss | 22.23.0-150600.13.18.1 | fixed |
| Suse | nodejs22 | linux enterprise server for sap applications 15 sp6 | 22.23.0-150600.13.18.1 | fixed |
| Suse | nodejs24 | linux enterprise module for web and scripting 15 sp7 | 24.17.0-150700.15.11.1 | fixed |
| Opensuse | nodejs24 | tumbleweed | 24.17.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-undici | source | sid | 8.5.0+dfsg+~cs3.2.0-1 | not yet assigned | Not reported | [1140363] |
| Debian | node-undici | source | forky | 8.5.0+dfsg+~cs3.2.0-1 | not yet assigned | Not reported | [1140363] |
| Debian | node-undici | source | trixie | (unfixed) | not yet assigned | Not reported | [1140363] |
| Debian | node-undici | source | bookworm | (unfixed) | not yet assigned | Not reported | [1140363] |
| Cpe | undici | cpe | Not reported | 6.27.0 | Not reported | Not reported | Not reported |
| Cpe | undici | cpe | Not reported | 7.28.0 | Not reported | Not reported | Not reported |
| Cpe | undici | cpe | Not reported | 8.5.0 | Not reported | Not reported | Not reported |
| Suse | nodejs24 | rpm | linux enterprise server 16.0 | 24.18.0-160000.1.1 | Not reported | SUSE-SU-2026:22565-1 | Not reported |
| Suse | nodejs24 | rpm | linux enterprise server for sap applications 16.0 | 24.18.0-160000.1.1 | Not reported | SUSE-SU-2026:22565-1 | Not reported |
| Opensuse | nodejs24 | rpm | leap 16.0 | 24.18.0-160000.1.1 | Not reported | OPENSUSE-SU-2026:21236-1 | Not reported |
| Suse | nodejs22 | rpm | linux enterprise server 16.0 | 22.23.0-160000.1.1 | Not reported | SUSE-SU-2026:22368-1 | Not reported |
| Suse | nodejs22 | rpm | linux enterprise server for sap applications 16.0 | 22.23.0-160000.1.1 | Not reported | SUSE-SU-2026:22368-1 | Not reported |
| Suse | nodejs22 | rpm | linux enterprise module for web and scripting 15 sp7 | 22.23.0-150700.3.12.1 | Not reported | SUSE-SU-2026:2695-1 | Not reported |
| Opensuse | nodejs22 | rpm | leap 16.0 | 22.23.0-160000.1.1 | Not reported | OPENSUSE-SU-2026:21058-1 | Not reported |
| Suse | nodejs22 | rpm | linux enterprise server 15 sp6-ltss | 22.23.0-150600.13.18.1 | Not reported | SUSE-SU-2026:2647-1 | Not reported |
| Suse | nodejs22 | rpm | linux enterprise server for sap applications 15 sp6 | 22.23.0-150600.13.18.1 | Not reported | SUSE-SU-2026:2647-1 | Not reported |
| Suse | nodejs24 | rpm | linux enterprise module for web and scripting 15 sp7 | 24.17.0-150700.15.11.1 | Not reported | SUSE-SU-2026:2633-1 | Not reported |
| Opensuse | nodejs24 | rpm | tumbleweed | 24.17.0-1.1 | Not reported | OPENSUSE-SU-2026:11121-1 | Not reported |
Notes
[trixie] node-undici: Minor issue [bookworm] node-undici: Minor issue; impact limited to consumers that forward the parsed sameSite attribute
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [node-llhttp]Affected
Source package: [node-undici]
Details (4)
8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4· all · bookwormAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4· all · bookwormAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3· all · bookworm-securityAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3· all · bookworm-securityAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
- [node-undici]Affected
Details (4)
5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4· all · bookwormAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4· all · bookwormAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3· all · bookworm-securityAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3· all · bookworm-securityAffected
nvd · node-undici · debian · bookworm; nvd · node-undici · debian · 12
[Debian 13 (Trixie)]
- [libllhttp9.2]Affected
Source package: [node-undici]
Details (2)
9.2.1~7.3.0+dfsg1+~cs24.12.11-1· amd64 · trixieAffected
nvd · node-undici · debian · 13
9.2.1~7.3.0+dfsg1+~cs24.12.11-1· arm64 · trixieAffected
nvd · node-undici · debian · 13
- [libllhttp-dev]Affected
Source package: [node-undici]
Details (2)
9.2.1~7.3.0+dfsg1+~cs24.12.11-1· amd64 · trixieAffected
nvd · node-undici · debian · 13
9.2.1~7.3.0+dfsg1+~cs24.12.11-1· arm64 · trixieAffected
nvd · node-undici · debian · 13
- [node-llhttp]Affected
Source package: [node-undici]
Details (2)
9.2.1~7.3.0+dfsg1+~cs24.12.11-1· all · trixieAffected
nvd · node-undici · debian · 13
9.2.1~7.3.0+dfsg1+~cs24.12.11-1· all · trixieAffected
nvd · node-undici · debian · 13
- [node-undici]Affected
Details (2)
7.3.0+dfsg1+~cs24.12.11-1· all · trixieAffected
nvd · node-undici · debian · 13
7.3.0+dfsg1+~cs24.12.11-1· all · trixieAffected
nvd · node-undici · debian · 13
[openSUSE Tumbleweed]
- [corepack24]Unknown
Source package: [nodejs24]
Details (1)
24.18.1-1.1· x86_64 · tumbleweedUnknown · Fixed:
24.17.0-1.1Version impact unknown
nvd · nodejs24 · opensuse · tumbleweed
- [nodejs24-devel]Unknown
Source package: [nodejs24]
Details (1)
24.18.1-1.1· x86_64 · tumbleweedUnknown · Fixed:
24.17.0-1.1Version impact unknown
nvd · nodejs24 · opensuse · tumbleweed
- [nodejs24-docs]Unknown
Source package: [nodejs24]
Details (1)
24.18.1-1.1· noarch · tumbleweedUnknown · Fixed:
24.17.0-1.1Version impact unknown
nvd · nodejs24 · opensuse · tumbleweed
- [npm24]Unknown
Source package: [nodejs24]
Details (1)
24.18.1-1.1· x86_64 · tumbleweedUnknown · Fixed:
24.17.0-1.1Version impact unknown
nvd · nodejs24 · opensuse · tumbleweed
- [nodejs24]Fixed
Source package: [nodejs24]
Details (1)
24.18.1-1.1· x86_64 · tumbleweedFixed · Fixed:
24.17.0-1.1nvd · nodejs24 · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11121-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-11525]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-11525]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22368-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22565-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2633-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2647-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2695-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11121-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21058-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21236-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-11525]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11525.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2919.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]