CVE-2026-109932

MEDIUMNVD 7.55.9
EchelonGraph scoreMEDIUM confidence

“▼” beside the score: it is lower than NVD's CVSS score.

Score 5.9 from GitHub Security Advisory (severity: MODERATE) published 2026-10-27. NVD baseline CVSS 7.5; sources differ by 1.6.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2026-102321 (ENISA EUVD) · GHSA-9fm3-97px-rjf6 (GitHub Security Advisories)Source: ENISA EUVD

5.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

undici is an HTTP client library for Node.js. In versions 5.15.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its WebSocket client, including the bundled WebSocket exposed by Node.js, can be driven to exhaust process memory by a malicious or compromised WebSocket server. For every PING frame received, the client automatically writes a PONG response and ignores the backpressure signal from the socket write, so a server that streams small PING frames while never reading the client's PONGs makes the outbound write queue and heap grow without bound until the Node.js process runs out of memory and terminates. The attack is remote and unauthenticated, needs only a normal WebSocket connection, and is asymmetric, since small inbound PINGs produce a much larger retained outbound queue, with availability the only impact. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which pause WebSocket frame parsing when the automatic PONG response hits socket backpressure and resume on drain, bounding the outbound queue, and users should upgrade to one of those versions or later. There is no workaround.

CVSS v3
7.5
EG Score
5.9MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100

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)
Severity59% × 45%
Impact severity (EG Severity): CVSS 5.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.3%
EPSS %ILE
25th
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 (5.9): severity, escalated by confirmed exploitation. This CVE's 5.9 is its impact severity (EG Severity), not escalated.

EG Severity
5.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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

October 15, 2026

Last Modified

October 19, 2026

Advisory Details (2)

Auto-updated Oct 15, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

undici WebSocket client vulnerable to Denial of Service via unbounded automatic PONG buffering · Advisory · nodejs/undici · GitHub

https://github.com/nodejs/undici/security/advisories/GHSA-9fm3-97px-rjf6
Web page

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html

Vendor Advisories for CVE-2026-109932(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatnodejs26-main-26.12.1-0.1.hum12026-10-22redhat
redhatnodejs26-main-11.20.0-1.26.11.1.0.4.hum12026-10-19redhat
redhatnodejs24-main-24.21.0-1.5.hum12026-10-19redhat
npmundici @ 6.29.1 (fixes >= 5.15.0, < 6.29.1)—ghsa
npmundici @ 7.30.1 (fixes >= 7.0.0, < 7.30.1)—ghsa
npmundici @ 8.12.2 (fixes >= 8.0.0, < 8.12.2)—ghsa

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)
PackageVulnerable rangeFix by version rangeDependents
node-undici5.15.0+dfsg1+~cs20.10.9.3-1 ... 8.9.0+dfsg+~cs3.2.0-1 (43 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
node-undici7.15.0+dfsg+~cs3.2.0-1 ... 8.9.0+dfsg+~cs3.2.0-1 (19 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
node-undici7.15.0+dfsg+~cs3.2.0-1 ... 8.9.0+dfsg+~cs3.2.0-1 (17 versions)
  • every version up to 8.12.2+dfsg+~cs3.2.3-1: fixed in 8.12.2+dfsg+~cs3.2.3-1
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
undici—
  • 5.15.0 up to 6.29.1: fixed in 6.29.1
  • 7.0.0 up to 7.30.1: fixed in 7.30.1
  • 8.0.0 up to 8.12.2: fixed in 8.12.2
—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 35× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  10. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  11. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  12. 2026-11-03 08:38 UTCEchelonGraph re-scored▼ 1.60
  13. 2026-11-03 08:38 UTCVendor advisory
  14. 2026-11-03 08:38 UTCGHSA enrichmentGHSA-9fm3-97px-rjf6 · GitHub severity MODERATE · GitHub CVSS 5.9
  15. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  17. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-10-27 18:05 UTCEchelonGraph re-scored
  22. 2026-10-27 18:05 UTCVendor advisory
  23. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Show 19 more
  1. 2026-10-25 14:53 UTCEchelonGraph re-scored
  2. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-10-19 20:48 UTCEchelonGraph re-scored▲ 1.60
  8. 2026-10-19 20:48 UTCVendor advisory
  9. 2026-10-19 20:45 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  10. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  11. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  12. 2026-10-18 05:06 UTCEchelonGraph re-scored
  13. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-16 20:33 UTCEchelonGraph re-scored
  15. 2026-10-16 20:13 UTCEchelonGraph re-scored
  16. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-10-15 19:37 UTCEchelonGraph re-scored
  18. 2026-10-15 19:02 UTCEchelonGraph re-scoredFirst assessed: 5.9 MEDIUM
  19. 2026-10-15 18:57 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-109932?
CVE-2026-109932 is a medium-severity vulnerability; its CVE record was published on October 15, 2026. undici is an HTTP client library for Node.js. In versions 5.15.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its WebSocket client, including the bundled WebSocket exposed by Node.js, can be driven to exhaust process memory by a malicious or compromised WebSocket server. For…
When was the CVE record for CVE-2026-109932 published?
The CVE record for CVE-2026-109932 was published on October 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-109932 actively exploited?
CVE-2026-109932 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-109932?
CVE-2026-109932 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 5.9 (MEDIUM).
How do I remediate CVE-2026-109932?
A fix for CVE-2026-109932 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-109932 are linked in the Vendor Advisories panel on this page.

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