CVE-2026-84890
Fixed in a distro release EPSS <1%CVSS 5.9
undici's decompress interceptor decompresses response bodies according to the untrusted Content-Encoding header. While the number of content-encoding layers is capped, the total decompressed output size is unbounded and there is no configuration option to limit it. A malicious or faulty upstream can therefore return a small compressed payload, a compression bomb, that expands to hundreds of megabytes or more in client memory, an asymmetric resource consumption that can exhaust memory and crash the process. This affects undici versions from 7.15.0 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 |