Description
The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive.
The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| undici | undici | < 6.24.0; 7.0.0 < 7.24.0 | 6.24.0: 7.24.0 |
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 | 7.24.5+dfsg+~cs3.2.0-1 | — |
| Debian 13 | 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 25.10 | node-undici | No fix yet | — |
| Ubuntu 24.04 LTS | node-undici | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | nodejs +5 | 1:22.22.2-1.el10_1 | RHSA-2026:7080 |
| RHEL 10 | nodejs-npm | 1:10.9.7-1.22.22.2.1.el10_1 | RHSA-2026:7080 |
| RHEL 10 | nodejs24 +4 | 1:24.14.1-2.el10_1 | RHSA-2026:7675 |
| RHEL 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 | RHSA-2026:7675 |
| RHEL 9 | nodejs +4 | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 | RHSA-2026:7350, RHSA-2026:7302 |
| RHEL 9 | nodejs-nodemon | 3.0.1-1.module+el9.7.0+24157+8ddb2461 | RHSA-2026:7350, RHSA-2026:7302 |
| RHEL 9 | nodejs-packaging +1 | 2021.06-6.module+el9.7.0+24157+8ddb2461 | RHSA-2026:7350, RHSA-2026:7302 |
| RHEL 9 | npm | 1:10.9.7-1.22.22.2.1.module+el9.7.0+24157+8ddb2461 | RHSA-2026:7350, RHSA-2026:7302 |
| RHEL 9 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el9.7.0+24157+8ddb2461 | RHSA-2026:7302 |
| RHEL 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+24166+51c9666b | RHSA-2026:7350 |
| RHEL 8 | nodejs +4 | 1:22.22.2-1.module+el8.10.0+24148+847b6786 | RHSA-2026:7670, RHSA-2026:7123 |
| RHEL 8 | nodejs-nodemon | 3.0.1-1.module+el8.10.0+24148+847b6786 | RHSA-2026:7670, RHSA-2026:7123 |
| RHEL 8 | nodejs-packaging +1 | 2021.06-6.module+el8.10.0+24148+847b6786 | RHSA-2026:7670, RHSA-2026:7123 |
| RHEL 8 | npm | 1:10.9.7-1.22.22.2.1.module+el8.10.0+24148+847b6786 | RHSA-2026:7670, RHSA-2026:7123 |
| RHEL 8 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el8.10.0+24148+847b6786 | RHSA-2026:7123 |
| RHEL 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+24190+49a46c75 | RHSA-2026:7670 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | nodejs +5 | 1:22.22.2-2.el10_0 | RHSA-2026:7310 |
| RHEL 10.0 EUS | nodejs-npm | 1:10.9.7-1.22.22.2.2.el10_0 | RHSA-2026:7310 |
| RHEL 9.6 EUS | nodejs +4 | 1:22.22.2-1.module+el9.6.0+24196+39669d4e | RHSA-2026:7983 |
| RHEL 9.6 EUS | nodejs-nodemon | 3.0.1-1.module+el9.6.0+23473+45664c2d | RHSA-2026:7983 |
| RHEL 9.6 EUS | nodejs-packaging +1 | 2021.06-4.module+el9.6.0+23473+45664c2d | RHSA-2026:7983 |
| RHEL 9.6 EUS | npm | 1:10.9.7-1.22.22.2.1.module+el9.6.0+24196+39669d4e | RHSA-2026:7983 |
| RHEL 9.6 EUS | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el9.6.0+24196+39669d4e | RHSA-2026:7983 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | nodejs-docs | 1:22.22.2-1.el10_1 | ALSA-2026:7080 |
| AlmaLinux 10 | nodejs24-docs | 1:24.14.1-2.el10_1 | ALSA-2026:7675 |
| AlmaLinux 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 | ALSA-2026:7675 |
| AlmaLinux 9 | nodejs +4 | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux 9 | nodejs-nodemon | 3.0.3-3.module_el9.7.0+209+ecf6523e | ALSA-2026:7350 |
| AlmaLinux 9 | nodejs-packaging | 2021.06-6.module_el9.7.0+209+ecf6523e | ALSA-2026:7350 |
| AlmaLinux 9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+198+8bf605ba | ALSA-2026:7350 |
| AlmaLinux 9 | npm | 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 | ALSA-2026:7350 |
| AlmaLinux 8 | nodejs +4 | 1:22.22.2-1.module_el8.10.0+4158+e796f37f | ALSA-2026:7670, ALSA-2026:7123 |
| AlmaLinux 8 | nodejs-nodemon | 3.0.1-1.module_el8.10.0+4006+3c416519 | ALSA-2026:7670, ALSA-2026:7123 |
| AlmaLinux 8 | nodejs-packaging +1 | 2021.06-6.module_el8.10.0+4086+70facd4a | ALSA-2026:7670, ALSA-2026:7123 |
| AlmaLinux 8 | npm | 1:10.9.7-1.22.22.2.1.module_el8.10.0+4158+e796f37f | ALSA-2026:7670, ALSA-2026:7123 |
| AlmaLinux 8 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module_el8.10.0+4158+e796f37f | ALSA-2026:7123 |
| AlmaLinux 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42 | ALSA-2026:7670 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | nodejs22 | 1:22.22.2-1.el10_1 | RLSA-2026:7080 |
| Rocky Linux 10 | nodejs24 | 1:24.14.1-2.el10_1 | RLSA-2026:7675 |
| Rocky Linux 9 | nodejs-nodemon | 3.0.1-1.module+el9.7.0+40017+f0db1785 | RLSA-2026:7350, RLSA-2026:7302 |
| Rocky Linux 9 | nodejs-packaging | 2021.06-6.module+el9.7.0+40052+e32ea525 | RLSA-2026:7350, RLSA-2026:7302 |
| Rocky Linux 8 | nodejs-nodemon | 3.0.1-1.module+el8.9.0+1760+903d54b9 | RLSA-2026:7670, RLSA-2026:7123 |
| Rocky Linux 8 | nodejs-packaging | 2021.06-6.module+el8.10.0+40048+6d99f608 | RLSA-2026:7670, RLSA-2026:7123 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | nodejs20 +4 | 1:20.20.1-1.amzn2023.0.3 | ALAS2023-2026-1524 |
| Amazon Linux 2023 | nodejs20-npm | 1:10.8.2-1.20.20.1.1.amzn2023.0.3 | ALAS2023-2026-1524 |
| Amazon Linux 2023 | nodejs22 +4 | 1:22.22.1-1.amzn2023.0.2 | ALAS2023-2026-1525 |
| Amazon Linux 2023 | nodejs22-npm | 1:10.9.4-1.22.22.1.1.amzn2023.0.2 | ALAS2023-2026-1525 |
| Amazon Linux 2023 | nodejs24 +4 | 1:24.14.0-1.amzn2023.0.2 | ALAS2023-2026-1526 |
| Amazon Linux 2023 | nodejs24-npm | 1:11.9.0-1.24.14.0.1.amzn2023.0.2 | ALAS2023-2026-1526 |
| Amazon Linux 2023 | v8-11.3-devel | 3:11.3.244.8-1.20.20.1.1.amzn2023.0.3 | ALAS2023-2026-1524 |
| Amazon Linux 2023 | v8-12.4-devel | 3:12.4.254.21-1.22.22.1.1.amzn2023.0.2 | ALAS2023-2026-1525 |
| Amazon Linux 2023 | v8-13.6-devel | 3:13.6.233.17-1.24.14.0.1.amzn2023.0.2 | ALAS2023-2026-1526 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | nodejs +4 | 1:22.22.2-1.el10_1 | ELSA-2026-7080 |
| Oracle Linux 10 | nodejs-npm | 1:10.9.7-1.22.22.2.1.el10_1 | ELSA-2026-7080 |
| Oracle Linux 10 | nodejs24 +4 | 1:24.14.1-2.0.2.el10_1 | ELSA-2026-7675 |
| Oracle Linux 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.0.2.el10_1 | ELSA-2026-7675 |
| Oracle Linux 9 | nodejs +4 | 1:22.22.2-1.module+el9.7.0+90867+2ede48fe | ELSA-2026-7350, ELSA-2026-7302 |
| Oracle Linux 9 | nodejs-nodemon | 3.0.1-1.module+el9.7.0+90867+2ede48fe | ELSA-2026-7350, ELSA-2026-7302 |
| Oracle Linux 9 | nodejs-packaging +1 | 2021.06-6.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350, ELSA-2026-7302 |
| Oracle Linux 9 | npm | 1:10.9.7-1.22.22.2.1.module+el9.7.0+90867+2ede48fe | ELSA-2026-7350, ELSA-2026-7302 |
| Oracle Linux 9 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el9.7.0+90867+2ede48fe | ELSA-2026-7302 |
| Oracle Linux 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+90866+5a953a4c | ELSA-2026-7350 |
| Oracle Linux 8 | nodejs +4 | 1:22.22.2-1.module+el8.10.0+90865+d647ef3a | ELSA-2026-7670, ELSA-2026-7123 |
| Oracle Linux 8 | nodejs-nodemon | 3.0.1-1.module+el8.10.0+90865+d647ef3a | ELSA-2026-7670, ELSA-2026-7123 |
| Oracle Linux 8 | nodejs-packaging +1 | 2021.06-4.module+el8.10.0+90865+d647ef3a | ELSA-2026-7670, ELSA-2026-7123 |
| Oracle Linux 8 | npm | 1:10.9.7-1.22.22.2.1.module+el8.10.0+90865+d647ef3a | ELSA-2026-7670, ELSA-2026-7123 |
| Oracle Linux 8 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el8.10.0+90865+d647ef3a | ELSA-2026-7123 |
| Oracle Linux 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+90873+35652ecc | ELSA-2026-7670 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | code-server | 4.110.1-r2 | — |
| Wolfi rolling | jitsucom-jitsu-rotor +1 | 2.11.0-r17 | — |
| Wolfi rolling | langfuse-3-worker | 3.179.1-r1 | — |
| Wolfi rolling | renovate | 43.84.0-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | undici | < 6.24.0 | 6.24.0 | GHSA-vrm6-8vpv-qv8q |
| npm | undici | >= 7.0.0, < 7.24.0 | 7.24.0 | GHSA-vrm6-8vpv-qv8q |
Advisories 29
- ALSA-2026:7350 Important: nodejs:24 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:7675 Important: nodejs24 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:7080 Important: nodejs22 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:7123 Important: nodejs:22 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:7670 Important: nodejs:24 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:7983 Red Hat Security Advisory: nodejs:22 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7675 Red Hat Security Advisory: nodejs24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7670 Red Hat Security Advisory: nodejs:24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7350 Red Hat Security Advisory: nodejs:24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7302 Red Hat Security Advisory: nodejs:22 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7310 Red Hat Security Advisory: nodejs22 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7123 Red Hat Security Advisory: nodejs:22 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:7080 Red Hat Security Advisory: nodejs22 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- ELSA-2026-7675 Important: nodejs24 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 9, 2026
- WID-SEC-2026-0933 IBM App Connect Enterprise (Hono und Undici): Mehrere Schwachstellen BSI CERT-Bund (WID) · May 31, 2026
- RLSA-2026:7675 Important: nodejs24 security update Rocky Linux Security Advisories · Apr 15, 2026
- RLSA-2026:7670 Important: nodejs:24 security update Rocky Linux Security Advisories · Apr 13, 2026
- ELSA-2026-7670 Important: nodejs:24 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 13, 2026
- RLSA-2026:7080 Important: nodejs22 security update Rocky Linux Security Advisories · Apr 12, 2026
- RLSA-2026:7350 Important: nodejs:24 security update Rocky Linux Security Advisories · Apr 10, 2026
- ELSA-2026-7350 Important: nodejs:24 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 10, 2026
- ELSA-2026-7302 Important: nodejs:22 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 10, 2026
- RLSA-2026:7302 Important: nodejs:22 security update Rocky Linux Security Advisories · Apr 9, 2026
- RLSA-2026:7123 Important: nodejs:22 security update Rocky Linux Security Advisories · Apr 9, 2026
- ELSA-2026-7123 Important: nodejs:22 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 9, 2026
- ELSA-2026-7080 Important: nodejs22 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Apr 8, 2026
- ALAS2023-2026-1524 Important: nodejs20 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026
- ALAS2023-2026-1525 Important: nodejs22 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026
- ALAS2023-2026-1526 Important: nodejs24 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026