CVE-2026-84933
Fixed in a distro release EPSS <1%CVSS 6.5
undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that carries a Set-Cookie header, for example one marked with a public and max-age directive, is stored and then re-served to a later caller that matches the same cache key. As a result one caller's cookie is disclosed to a different caller, and an untrusted server can inject cookies into cached responses served to all subsequent callers. This violates the requirement that a shared cache must not store cookies. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.
Products: undici
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | undici | 7.29.1 |
| npm | undici | 8.10.2 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2023 | nodejs24 | 1:24.21.0-1.amzn2023.0.1 |
| Amazon Linux 2023 | nodejs24-devel | 1:24.21.0-1.amzn2023.0.1 |
| Amazon Linux 2023 | nodejs24-docs | 1:24.21.0-1.amzn2023.0.1 |
| Amazon Linux 2023 | nodejs24-full-i18n | 1:24.21.0-1.amzn2023.0.1 |
| Amazon Linux 2023 | nodejs24-libs | 1:24.21.0-1.amzn2023.0.1 |
| Amazon Linux 2023 | nodejs24-npm | 1:11.19.0-1.24.21.0.1.amzn2023.0.1 |
| Amazon Linux 2023 | v8-13.6-devel | 3:13.6.233.17-1.24.21.0.1.amzn2023.0.1 |
| Chainguard | code-server | 4.139.1-r2 |
| Chainguard | commercial-gitlab-rails-ee-19.1 | 19.1.7-r3 |
| Chainguard | commercial-gitlab-rails-ee-19.2 | 19.2.7-r1 |
| Chainguard | commercial-gitlab-rails-ee-19.3 | 19.3.3-r1 |
| Chainguard | commercial-gitlab-rails-ee-19.4 | 19.4.1-r1 |
| Chainguard | commercial-gitlab-rails-ee-fips-19.1 | 19.1.9-r0 |
| Chainguard | commercial-gitlab-rails-ee-fips-19.2 | 19.2.7-r1 |
| Chainguard | commercial-gitlab-rails-ee-fips-19.3 | 19.3.3-r1 |
| Chainguard | commercial-gitlab-rails-ee-fips-19.4 | 19.4.1-r1 |
| Chainguard | homepage | 2.4.0-r1 |
| Chainguard | kibana-9.2 | 9.2.8-r23 |
| Chainguard | lerna | 10.0.1-r11 |
| Chainguard | node-gyp | 13.0.2-r1 |
| Chainguard | prism | 5.16.0-r14 |
| Debian 12 | node-undici | no fix |
| Debian 13 | node-undici | no fix |
| Debian 14 | node-undici | 8.10.2+dfsg+~cs3.2.2-1 |
| Red Hat hummingbird 1 | grafana12.4 | 0:12.4.10-0.2.hum1 |
| Red Hat hummingbird 1 | nodejs24 | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-bin | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-devel | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-docs | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-full-i18n | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-libs | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-npm | 0:11.16.0-1.24.18.1.0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs24-npm-bin | 0:24.18.1-0.2.2.hum1 |
| Red Hat hummingbird 1 | nodejs26 | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-bin | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-devel | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-docs | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-full-i18n | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-libs | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-npm | 0:11.19.0-1.26.7.0.1.5.2.hum1 |
| Red Hat hummingbird 1 | nodejs26-npm-bin | 0:26.7.0-1.5.2.hum1 |
| Red Hat hummingbird 1 | v8-14.6-devel | 0:14.6.202.34-1.26.7.0.1.5.2.hum1 |
| Ubuntu 24.04 LTS | node-undici | no fix |
| Ubuntu 26.04 LTS | node-undici | no fix |
| Ubuntu 26.10 | node-undici | no fix |
| Wolfi | code-server | 4.139.1-r2 |
| Wolfi | lerna | 10.0.1-r11 |
| Wolfi | node-gyp | 13.0.2-r1 |
| Wolfi | prism | 5.16.0-r14 |
| openSUSE Leap 16.0 | pi-coding-agent | 1.0.4-bp160.1.1 |
| openSUSE Tumbleweed | pi-coding-agent | 0.87.1-1.1 |