undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server's 101 response includes a Sec-WebSocket-Protocol header, undici dereferences a null value while checking it against the requested list and throws an uncaught TypeError. Because that code runs inside a microtask with no surrounding error handling, the exception propagates and terminates the process under Node's default behavior, instead of gracefully failing the connection as required by the WebSocket protocol. Any application that opens a WebSocket to an attacker-controlled or compromised server, or over a plaintext connection subject to a machine-in-the-middle, can be crashed remotely without authentication in the default configuration. This affects undici versions from 6.7.0 up to 6.28.1, from 7.0.0 up to 7.29.1, and from 8.0.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.
CVE-2026-19534
“—” beside the score: it is equal to the CVSS score beside it.
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (33rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-71636 (ENISA EUVD) · GHSA-rfgv-xxqx-mfg5 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 49EG Risk 49/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.4% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.4%
- EPSS %ILE
- 33rd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 4, 2026
Last Modified
September 16, 2026
Advisory Details (2)
Auto-updated Sep 4, 2026Security Advisories | OpenJS Foundation CVE Numbering Authority
https://cna.openjsf.org/security-advisories.htmlundici vulnerable to Denial of Service via unrequested WebSocket subprotocol · Advisory · nodejs/undici · GitHub
https://github.com/nodejs/undici/security/advisories/GHSA-rfgv-xxqx-mfg5Vendor Advisories for CVE-2026-19534(20)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:87410Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI
- RHSA-2026:86891Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI
- RHSA-2026:84734Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI
- RHSA-2026:84703Red Hat Product SecurityHigh
Red Hat Security Advisory: nodejs22 security update
- RHSA-2026:84589Red Hat Product SecurityHigh
Red Hat Security Advisory: nodejs:22 security update
- RHSA-2026:82151Red Hat Product SecurityCritical
Red Hat Security Advisory: Ansible automation portal Red Hat Enterprise Linux Images
- RHSA-2026:76750Red Hat Product SecurityHigh
Red Hat Security Advisory: nodejs:22 security update
- RHSA-2026:79088Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Developer Hub 1.10.5 release.
- +12 more
Patch Availability(21)
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(4 across 4 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-undici | 5.15.0+dfsg1+~cs20.10.9.3-1 ... 8.9.0+dfsg+~cs3.2.0-1 (40 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-undici | 7.15.0+dfsg+~cs3.2.0-1 ... 8.9.0+dfsg+~cs3.2.0-1 (16 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-undici | 7.15.0+dfsg+~cs3.2.0-1 ... 8.9.0+dfsg+~cs3.2.0-1 (15 versions) |
| — |
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| undici | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(2)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Data Freshness Timeline
(refreshed 10× in last 7d / 74× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 147 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 47 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-25 14:44 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-24 04:58 UTCEG score recompute
- 2026-10-24 04:58 UTCVendor advisory
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-18 03:58 UTCEG score recompute
- 2026-10-17 17:42 UTCEG score recompute
- 2026-10-17 17:42 UTCVendor advisory
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-12 16:25 UTCEG score recompute
- 2026-10-11 20:06 UTCEG score recompute
- 2026-10-11 17:19 UTCEG score recompute
- 2026-10-11 14:51 UTCEG score recompute
Show 75 moreShow fewer
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-10 10:52 UTCVendor advisory
- 2026-10-09 23:06 UTCEG score recompute
- 2026-10-09 23:06 UTCVendor advisory
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-09 01:09 UTCEG score recompute
- 2026-10-09 01:09 UTCVendor advisory
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-07 23:04 UTCVendor advisory
- 2026-10-07 09:48 UTCVendor advisory
- 2026-10-06 22:24 UTCEG score recompute
- 2026-10-06 22:24 UTCVendor advisory
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-06 11:00 UTCVendor advisory
- 2026-10-05 23:00 UTCEG score recompute
- 2026-10-05 23:00 UTCVendor advisory
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-05 11:13 UTCVendor advisory
- 2026-10-04 23:44 UTCEG score recompute
- 2026-10-04 23:44 UTCVendor advisory
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-04 12:20 UTCVendor advisory
- 2026-10-04 00:56 UTCEG score recompute
- 2026-10-04 00:56 UTCVendor advisory
- 2026-10-03 12:33 UTCVendor advisory
- 2026-10-03 00:44 UTCEG score recompute
- 2026-10-03 00:44 UTCVendor advisory
- 2026-10-02 13:20 UTCVendor advisory
- 2026-10-02 01:54 UTCEG score recompute
- 2026-10-02 01:54 UTCVendor advisory
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-01 14:15 UTCVendor advisory
- 2026-10-01 02:50 UTCVendor advisory
- 2026-09-30 15:26 UTCEG score recompute
- 2026-09-30 15:26 UTCVendor advisory
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-30 02:40 UTCEG score recompute
- 2026-09-30 02:40 UTCVendor advisory
- 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-29 12:13 UTCVendor advisory
- 2026-09-29 00:49 UTCEG score recompute
- 2026-09-29 00:49 UTCVendor advisory
- 2026-09-28 13:21 UTCVendor advisory
- 2026-09-28 01:57 UTCVendor advisory
- 2026-09-27 14:15 UTCEG score recompute
- 2026-09-27 14:15 UTCVendor advisory
- 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-09-27 02:45 UTCEG score recompute
- 2026-09-27 02:45 UTCVendor advisory
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-09-26 15:20 UTCVendor advisory
- 2026-09-26 02:09 UTCEG score recompute
- 2026-09-26 02:09 UTCVendor advisory
- 2026-09-25 11:42 UTCVendor advisory
- 2026-09-25 00:08 UTCEG score recompute
- 2026-09-25 00:08 UTCVendor advisory
- 2026-09-24 12:18 UTCVendor advisory
- 2026-09-24 00:53 UTCEG score recompute
- 2026-09-24 00:53 UTCVendor advisory
- 2026-09-23 13:29 UTCVendor advisory
- 2026-09-23 02:05 UTCEG score recompute
- 2026-09-23 02:05 UTCVendor advisory
- 2026-09-22 14:41 UTCVendor advisory
- 2026-09-22 03:03 UTCEG score recompute
- 2026-09-22 03:03 UTCVendor advisory
- 2026-09-21 15:37 UTCVendor advisory
- 2026-09-21 04:13 UTCEG score recompute
- 2026-09-21 04:13 UTCVendor advisory
- 2026-09-20 16:49 UTCVendor advisory
- 2026-09-20 05:25 UTCVendor advisory
- 2026-09-19 18:02 UTCEG score recompute
- 2026-09-19 18:02 UTCVendor advisory
- 2026-09-19 06:35 UTCEG score recompute
Related CVEs
Related CVEs are temporarily unavailable — the same-product, same-vendor and same-CWE lists could not be loaded just now. That is not a sign that none exist; please retry shortly.
Frequently asked(5)
What is CVE-2026-19534?
When was the CVE record for CVE-2026-19534 published?
Is CVE-2026-19534 actively exploited?
What is the CVSS score of CVE-2026-19534?
How do I remediate CVE-2026-19534?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-19534
Is Your Infrastructure Affected by CVE-2026-19534?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.