CVE-2026-12151
undici WebSocket client vulnerable to denial of service via fragment count bypass
02 Description
undici WebSocket client vulnerable to denial of service via fragment count bypass
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
- 0.78% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 55.7% 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
- Modified. NVD last modified this record on 2026-09-11.
- 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
- 2026-06-17 16:05Z4 MO AGO
- Last updated
- 2026-09-11 12:08Z1 MO AGO
- Reserved
- 2026-06-12
- 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
- c9c23de55674d289ed7eb13892aa1101e02d443c93e0ca4b724ef051f1b79910
05 Affected products
06 References
- github.comhttps://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q
- cna.openjsf.orghttps://cna.openjsf.org/security-advisories.html
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-12151
- bugzilla.redhat.comRHBZ#2489980https://bugzilla.redhat.com/show_bug.cgi?id=2489980
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12151.json
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:48151
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:39246
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:35842
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:35841
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:41947
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:39868
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:52399
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:35892
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:35891
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:34342
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:66545
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:66488
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:36754
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:41929
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:38236
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:38009
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:65126
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:60520
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:36621
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:47728
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:48124
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:36820
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:62260
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:56431
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:56366
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:57013
07 Fixed in
AlmaLinux 8
- nodejs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el8.10.0+3956+47c9ee9f
- Affected before 3.0.3-1.module_el8.10.0+4061+f8ceeab9
- 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 1:10.9.8-1.22.23.1.1.module_el8.10.0+4231+1bf2f855
- Affected before 1:11.16.0-1.24.18.0.1.module_el8.10.0+4228+2938bc94
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.1.1.module_el8.10.0+4231+1bf2f855
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.18.0.1.module_el8.10.0+4228+2938bc94
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 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el9.7.0+208+fb06c0ab
- Affected before 3.0.3-3.module_el9.7.0+209+ecf6523e
- 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 1:10.9.8-1.22.23.1.1.module_el9.8.0+276+8b329b47
- Affected before 1:11.16.0-1.24.18.0.1.module_el9.8.0+277+61fc613e
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.1.1.module_el9.8.0+276+8b329b47
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.18.0.1.module_el9.8.0+277+61fc613e
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 1:22.23.1-2.el10_2
- nodejs-devel Fixed in 1:22.23.1-2.el10_2
- nodejs-docs Fixed in 1:22.23.1-2.el10_2
- nodejs-full-i18n Fixed in 1:22.23.1-2.el10_2
- nodejs-libs Fixed in 1:22.23.1-2.el10_2
- nodejs-npm Fixed in 1:10.9.8-1.22.23.1.2.el10_2
- nodejs24 Fixed in 1:24.18.0-1.el10_2
- nodejs24-devel Fixed in 1:24.18.0-1.el10_2
- nodejs24-docs Fixed in 1:24.18.0-1.el10_2
- nodejs24-full-i18n Fixed in 1:24.18.0-1.el10_2
- nodejs24-libs Fixed in 1:24.18.0-1.el10_2
- nodejs24-npm Fixed in 1:11.16.0-1.24.18.0.1.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 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el8.10.0+4231+1bf2f855
- Affected before 1:24.18.0-1.module_el8.10.0+4228+2938bc94
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el8.10.0+3956+47c9ee9f
- Affected before 3.0.3-1.module_el8.10.0+4061+f8ceeab9
- 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 1:10.9.8-1.22.23.1.1.module_el8.10.0+4231+1bf2f855
- Affected before 1:11.16.0-1.24.18.0.1.module_el8.10.0+4228+2938bc94
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.1.1.module_el8.10.0+4231+1bf2f855
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.18.0.1.module_el8.10.0+4228+2938bc94
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 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-devel Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-docs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-full-i18n Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-libs Fixed
A version is affected if any line below covers it.
- Affected before 1:22.23.1-1.module_el9.8.0+276+8b329b47
- Affected before 1:24.18.0-1.module_el9.8.0+277+61fc613e
- nodejs-nodemon Fixed
A version is affected if any line below covers it.
- Affected before 3.0.1-1.module_el9.7.0+208+fb06c0ab
- Affected before 3.0.3-3.module_el9.7.0+209+ecf6523e
- 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 1:10.9.8-1.22.23.1.1.module_el9.8.0+276+8b329b47
- Affected before 1:11.16.0-1.24.18.0.1.module_el9.8.0+277+61fc613e
- v8-12.4-devel Fixed in 3:12.4.254.21-1.22.23.1.1.module_el9.8.0+276+8b329b47
- v8-13.6-devel Fixed in 3:13.6.233.17-1.24.18.0.1.module_el9.8.0+277+61fc613e
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 1:22.23.1-2.el10_2
- nodejs-devel Fixed in 1:22.23.1-2.el10_2
- nodejs-docs Fixed in 1:22.23.1-2.el10_2
- nodejs-full-i18n Fixed in 1:22.23.1-2.el10_2
- nodejs-libs Fixed in 1:22.23.1-2.el10_2
- nodejs-npm Fixed in 1:10.9.8-1.22.23.1.2.el10_2
- nodejs24 Fixed in 1:24.18.0-1.el10_2
- nodejs24-devel Fixed in 1:24.18.0-1.el10_2
- nodejs24-docs Fixed in 1:24.18.0-1.el10_2
- nodejs24-full-i18n Fixed in 1:24.18.0-1.el10_2
- nodejs24-libs Fixed in 1:24.18.0-1.el10_2
- nodejs24-npm Fixed in 1:11.16.0-1.24.18.0.1.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 8.5.0+dfsg+~cs3.2.0-1
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 25.10
- node-undici No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
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.