CVE-2026-19534
undici vulnerable to Denial of Service via unrequested WebSocket subprotocol
02 Description
undici vulnerable to Denial of Service via unrequested WebSocket subprotocol
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.39% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 33.3% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-09-16.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-04 17:10Z1 MO AGO
- Last updated
- 2026-09-04 18:18Z1 MO AGO
- Reserved
- 2026-08-11
- Assigning CNA
- openjs
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- ed8e2ddd4f6fb22d0e671fb1f54a58b582a434a7c53a861e0d8050bc76764096
05 Affected products
06 References
07 Fixed in
AlmaLinux 8
- nodejs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.1.14-2.module_el8.10.0+4250+09238ed4
- Affected before 3.1.14-2.module_el8.10.0+4252+aedd4c30
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- Affected before 2021.06-6.module_el8.10.0+4158+e796f37f
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- Affected before 2021.06-6.module_el8.10.0+4158+e796f37f
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.9.8-1.22.23.2.2.module_el8.10.0+4296+737cb4d7
- Affected before 1:11.19.0-1.24.21.0.1.module_el8.10.0+4292+21afb960
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.2.2.module_el8.10.0+4296+737cb4d7
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.21.0.1.module_el8.10.0+4292+21afb960
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- nodejs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.1.14-2.module_el9.8.0+302+959ebcd4
- Affected before 3.1.14-3.module_el9.8.0+292+f4eaf8b2
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el9.7.0+209+ecf6523e
- Affected before 2021.06-6.module_el9.7.0+227+12323393
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el9.7.0+209+ecf6523e
- Affected before 2021.06-6.module_el9.7.0+227+12323393
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.9.8-1.22.23.2.2.module_el9.8.0+322+f4aa738c
- Affected before 1:11.19.0-1.24.21.0.1.module_el9.8.0+321+1555b6a2
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.2.2.module_el9.8.0+322+f4aa738c
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.21.0.1.module_el9.8.0+321+1555b6a2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- nodejs Fixed in 1:22.23.2-3.el10_2
- nodejs-devel Fixed in 1:22.23.2-3.el10_2
- nodejs-docs Fixed in 1:22.23.2-3.el10_2
- nodejs-full-i18n Fixed in 1:22.23.2-3.el10_2
- nodejs-libs Fixed in 1:22.23.2-3.el10_2
- nodejs-npm Fixed in 1:10.9.8-1.22.23.2.3.el10_2
- nodejs24 Fixed in 1:24.21.0-1.el10_2
- nodejs24-devel Fixed in 1:24.21.0-1.el10_2
- nodejs24-docs Fixed in 1:24.21.0-1.el10_2
- nodejs24-full-i18n Fixed in 1:24.21.0-1.el10_2
- nodejs24-libs Fixed in 1:24.21.0-1.el10_2
- nodejs24-npm Fixed in 2:11.19.0-1.24.21.0.1.el10_2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- nodejs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el8.10.0+4296+737cb4d7
- Affected before 1:24.21.0-1.module_el8.10.0+4292+21afb960
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.1.14-2.module_el8.10.0+4250+09238ed4
- Affected before 3.1.14-2.module_el8.10.0+4252+aedd4c30
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- Affected before 2021.06-6.module_el8.10.0+4158+e796f37f
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el8.10.0+4086+70facd4a
- Affected before 2021.06-6.module_el8.10.0+4158+e796f37f
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.9.8-1.22.23.2.2.module_el8.10.0+4296+737cb4d7
- Affected before 1:11.19.0-1.24.21.0.1.module_el8.10.0+4292+21afb960
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.2.2.module_el8.10.0+4296+737cb4d7
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.21.0.1.module_el8.10.0+4292+21afb960
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- nodejs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.2-2.module_el9.8.0+322+f4aa738c
- Affected before 1:24.21.0-1.module_el9.8.0+321+1555b6a2
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.1.14-2.module_el9.8.0+302+959ebcd4
- Affected before 3.1.14-3.module_el9.8.0+292+f4eaf8b2
- nodejs-packaging Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el9.7.0+209+ecf6523e
- Affected before 2021.06-6.module_el9.7.0+227+12323393
- nodejs-packaging-bundler Fixed
A version is affected if any line below covers it.
- Affected before 2021.06-6.module_el9.7.0+209+ecf6523e
- Affected before 2021.06-6.module_el9.7.0+227+12323393
- npm Fixed
A version is affected if any line below covers it.
- Affected before 1:10.9.8-1.22.23.2.2.module_el9.8.0+322+f4aa738c
- Affected before 1:11.19.0-1.24.21.0.1.module_el9.8.0+321+1555b6a2
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.2.2.module_el9.8.0+322+f4aa738c
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.21.0.1.module_el9.8.0+321+1555b6a2
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- nodejs Fixed in 1:22.23.2-3.el10_2
- nodejs-devel Fixed in 1:22.23.2-3.el10_2
- nodejs-docs Fixed in 1:22.23.2-3.el10_2
- nodejs-full-i18n Fixed in 1:22.23.2-3.el10_2
- nodejs-libs Fixed in 1:22.23.2-3.el10_2
- nodejs-npm Fixed in 1:10.9.8-1.22.23.2.3.el10_2
- nodejs24 Fixed in 1:24.21.0-1.el10_2
- nodejs24-devel Fixed in 1:24.21.0-1.el10_2
- nodejs24-docs Fixed in 1:24.21.0-1.el10_2
- nodejs24-full-i18n Fixed in 1:24.21.0-1.el10_2
- nodejs24-libs Fixed in 1:24.21.0-1.el10_2
- nodejs24-npm Fixed in 2:11.19.0-1.24.21.0.1.el10_2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- node-undici No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- node-undici No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- node-undici Fixed in 8.10.2+dfsg+~cs3.2.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- node-undici No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- node-undici No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- node-undici No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.