CVE-2026-2229
Fixed in a distro release EPSS <1%CVSS 7.5
ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination. The vulnerability exists because: * The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15 * The createInflateRaw() call is not wrapped in a try-catch block * The resulting exception propagates up through the call stack and crashes the Node.js process
Products: undici, Red Hat Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Cluster Observability Operator 1.5.0, Red Hat Developer Hub 1.8, Red Hat Developer Hub 1.9, Red Hat OpenShift AI 2.16, Red Hat Openshift Data Foundation 4.18, Red Hat OpenShift Dev Spaces 3.28, Red Hat OpenShift Pipelines 1.2, Red Hat OpenShift Lightspeed, Red Hat OpenShift Pipelines, Red Hat Developer Hub, Red Hat JBoss Enterprise Application Platform 8, Red Hat JBoss Enterprise Application Platform Expansion Pack, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Dev Spaces, Red Hat Self-service automation portal 2
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | undici | 6.24.0 |
| npm | undici | 7.24.0 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | nodejs-docs | 1:22.22.2-1.el10_1 |
| AlmaLinux 10 | nodejs24-docs | 1:24.14.1-2.el10_1 |
| AlmaLinux 10 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 |
| AlmaLinux 8 | nodejs | 1:22.22.2-1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | nodejs | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 8 | nodejs-devel | 1:22.22.2-1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | nodejs-devel | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 8 | nodejs-docs | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 8 | nodejs-docs | 1:22.22.2-1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | nodejs-full-i18n | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 8 | nodejs-full-i18n | 1:22.22.2-1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | nodejs-libs | 1:24.14.1-2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 8 | nodejs-libs | 1:22.22.2-1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | nodejs-nodemon | 3.0.3-1.module_el8.10.0+4061+f8ceeab9 |
| AlmaLinux 8 | nodejs-nodemon | 3.0.1-1.module_el8.10.0+4006+3c416519 |
| AlmaLinux 8 | nodejs-packaging | 2021.06-6.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | nodejs-packaging | 2021.06-6.module_el8.10.0+4086+70facd4a |
| AlmaLinux 8 | nodejs-packaging-bundler | 2021.06-6.module_el8.10.0+4086+70facd4a |
| AlmaLinux 8 | nodejs-packaging-bundler | 2021.06-6.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | npm | 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 8 | npm | 1:10.9.7-1.22.22.2.1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module_el8.10.0+4158+e796f37f |
| AlmaLinux 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42 |
| AlmaLinux 9 | nodejs | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 |
| AlmaLinux 9 | nodejs-devel | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 |
| AlmaLinux 9 | nodejs-docs | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 |
| AlmaLinux 9 | nodejs-full-i18n | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 |
| AlmaLinux 9 | nodejs-libs | 1:24.14.1-2.module_el9.7.0+222+ef1c61e1 |
| AlmaLinux 9 | nodejs-nodemon | 3.0.3-3.module_el9.7.0+209+ecf6523e |
| AlmaLinux 9 | nodejs-packaging | 2021.06-6.module_el9.7.0+209+ecf6523e |
| AlmaLinux 9 | nodejs-packaging-bundler | 2021.06-6.module_el9.7.0+198+8bf605ba |
| AlmaLinux 9 | npm | 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 |
| AlmaLinux 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1 |
| Chainguard | code-server | 4.110.1-r2 |
| Chainguard | gemini-cli | 0.49.0-r4 |
| Chainguard | jitsucom-jitsu-console | 2.11.0-r17 |
| Chainguard | jitsucom-jitsu-rotor | 2.11.0-r17 |
| Chainguard | kibana-8.17 | 8.17.10-r13 |
| Chainguard | kibana-8.17-bitnami | 8.17.10-r13 |
| Chainguard | kibana-8.17-iamguarded | 8.17.10-r13 |
| Chainguard | kibana-8.18 | 8.18.8-r11 |
| Chainguard | kibana-8.18-bitnami | 8.18.8-r11 |
| Chainguard | kibana-8.18-iamguarded | 8.18.8-r11 |
| Chainguard | kibana-8.19 | 8.19.13-r4 |
| Chainguard | kibana-8.19-bitnami | 8.19.13-r4 |
| Chainguard | kibana-8.19-iamguarded | 8.19.13-r4 |
| Chainguard | kibana-9.0 | 9.0.8-r14 |
| Chainguard | kibana-9.0-bitnami | 9.0.8-r14 |
| Chainguard | kibana-9.0-iamguarded | 9.0.8-r14 |
| Chainguard | kibana-9.1 | 9.1.10-r7 |
| Chainguard | kibana-9.1-iamguarded | 9.1.10-r7 |
| Chainguard | kibana-9.2 | 9.2.7-r0 |
| Chainguard | kibana-9.2 | 9.2.6-r3 |
| Chainguard | kibana-9.2-iamguarded | 9.2.6-r3 |
| Chainguard | kibana-9.3 | 9.3.2-r0 |
| Chainguard | kibana-9.3-iamguarded | 9.3.2-r0 |
| Chainguard | kibana-9.3-iamguarded | 9.3.1-r2 |
| Chainguard | langfuse-3-worker | 3.179.1-r1 |
| Chainguard | langfuse-fips-3-worker | 3.179.1-r1 |
| Chainguard | langfuse-fips-3.152-worker | no fix |
| Chainguard | librechat | 0.8.4-r3 |
| Chainguard | pelias-api | 7.6.0-r4 |
| Chainguard | renovate | 43.84.0-r1 |
| Debian 12 | node-undici | no fix |
| Debian 13 | node-undici | no fix |
| Debian 14 | node-undici | 7.24.5+dfsg+~cs3.2.0-1 |
| Red Hat Enterprise Linux 10.1 | nodejs | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-debuginfo | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-devel | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-docs | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-full-i18n | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-libs | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-libs-debuginfo | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs-npm | 1:10.9.7-1.22.22.2.1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs22 | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs22-debuginfo | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs22-debugsource | 1:22.22.2-1.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24 | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-debuginfo | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-debugsource | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-devel | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-docs | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-full-i18n | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-libs | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-libs-debuginfo | 1:24.14.1-2.el10_1 |
| Red Hat Enterprise Linux 10.1 | nodejs24-npm | 1:11.11.0-1.24.14.1.2.el10_1 |
| Red Hat Enterprise Linux 8 | nodejs | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-debuginfo | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-debuginfo | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-debugsource | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-debugsource | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-devel | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-devel | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-docs | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-docs | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-full-i18n | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-full-i18n | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-libs | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-libs | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-libs-debuginfo | 1:22.22.2-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-libs-debuginfo | 1:24.14.1-2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-nodemon | 0:3.0.3-1.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-packaging-bundler | 0:2021.06-6.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | nodejs-packaging-bundler | 0:2021.06-6.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | npm | 1:10.9.7-1.22.22.2.1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | npm | 1:11.11.0-1.24.14.1.2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 8 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el8.10.0+24148+847b6786 |
| Red Hat Enterprise Linux 8 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+24190+49a46c75 |
| Red Hat Enterprise Linux 9 | nodejs | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-debuginfo | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-debuginfo | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-debugsource | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-debugsource | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-devel | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-devel | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-docs | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-docs | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-full-i18n | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-full-i18n | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-libs | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-libs | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-libs-debuginfo | 1:24.14.1-2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-libs-debuginfo | 1:22.22.2-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-nodemon | 0:3.0.3-3.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | nodejs-packaging-bundler | 0:2021.06-6.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | nodejs-packaging-bundler | 0:2021.06-6.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | npm | 1:11.11.0-1.24.14.1.2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux 9 | npm | 1:10.9.7-1.22.22.2.1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el9.7.0+24157+8ddb2461 |
| Red Hat Enterprise Linux 9 | v8-13.6-devel | 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+24166+51c9666b |
| Red Hat Enterprise Linux eus 10.0 | nodejs | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-debuginfo | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-devel | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-docs | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-full-i18n | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-libs | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-libs-debuginfo | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs-npm | 1:10.9.7-1.22.22.2.2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs22 | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs22-debuginfo | 1:22.22.2-2.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | nodejs22-debugsource | 1:22.22.2-2.el10_0 |
| Red Hat rhel eus 9.6 | nodejs | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-debuginfo | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-debugsource | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-devel | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-docs | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-full-i18n | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-libs | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-libs-debuginfo | 1:22.22.2-1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | nodejs-nodemon | 0:3.0.1-1.module+el9.6.0+23473+45664c2d |
| Red Hat rhel eus 9.6 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+23473+45664c2d |
| Red Hat rhel eus 9.6 | nodejs-packaging-bundler | 0:2021.06-4.module+el9.6.0+23473+45664c2d |
| Red Hat rhel eus 9.6 | npm | 1:10.9.7-1.22.22.2.1.module+el9.6.0+24196+39669d4e |
| Red Hat rhel eus 9.6 | v8-12.4-devel | 3:12.4.254.21-1.22.22.2.1.module+el9.6.0+24196+39669d4e |
| Rocky Linux 10 | nodejs22 | 1:22.22.2-1.el10_1 |
| Rocky Linux 10 | nodejs24 | 1:24.14.1-2.el10_1 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1823+b5789597 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1824+532140ee |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.3-1.module+el8.10.0+2084+ab509703 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1989+e60144d9 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1666+930e28e8 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.9.0+1760+903d54b9 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1667+4a788d89 |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1935+d3cbe60f |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1924+614dc87f |
| Rocky Linux 8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1988+437f3d23 |
| Rocky Linux 8 | nodejs-packaging | 0:2021.06-6.module+el8.10.0+40048+6d99f608 |
| Rocky Linux 9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40018+a011993d |
| Rocky Linux 9 | nodejs-nodemon | 0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2 |
| Rocky Linux 9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40022+9ecc286c |
| Rocky Linux 9 | nodejs-nodemon | 0:3.0.1-1.module+el9.7.0+40017+f0db1785 |
| Rocky Linux 9 | nodejs-packaging | 0:2021.06-6.module+el9.7.0+40052+e32ea525 |
| Ubuntu 24.04 LTS | node-undici | no fix |
| Ubuntu 25.10 | node-undici | no fix |
| Ubuntu 26.04 LTS | node-undici | no fix |
| Ubuntu 26.10 | node-undici | no fix |
| Wolfi | code-server | 4.110.1-r2 |
| Wolfi | jitsucom-jitsu-console | 2.11.0-r17 |
| Wolfi | jitsucom-jitsu-rotor | 2.11.0-r17 |
| Wolfi | langfuse-3-worker | 3.179.1-r1 |
| Wolfi | renovate | 43.84.0-r1 |