CVE-2026-12151

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service.

Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.

All releases starting at undici 6.17.0 are affected.

Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

June 17, 2026

Last Modified

July 21, 2026

Advisory Details (2)

Auto-updated Jun 17, 2026
Patch available. Sources: github.
github Patch Available

undici WebSocket client vulnerable to denial of service via fragment count bypass · Advisory · nodejs/undici · GitHub

https://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

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

Vendor Advisories for CVE-2026-12151(15)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhdh/rhdh-hub-rhel9:17842109212026-07-20redhat
redhatnodejs:22-8100020260703140402.6d8804032026-07-20redhat
redhatopenshift4/ose-monitoring-plugin-rhel9:17833063962026-07-16redhat
redhatnodejs:24-8100020260630152626.6d8804032026-07-15redhat
redhatnodejs22-1:22.23.1-2.el10_02026-07-14redhat
redhatnodejs24-main-24.18.0-0.3.hum12026-07-11redhat
redhatnodejs26-main-26.5.0-1.3.hum12026-07-10redhat
redhatdevspaces/pluginregistry-rhel9:17829893672026-07-08redhat
redhatrhdh/rhdh-hub-rhel9:17834481842026-07-08redhat
redhatnodejs:22-9080020260626075442.rhel92026-07-06redhat
redhatnodejs24-1:24.18.0-1.el10_22026-07-06redhat
redhatnodejs22-1:22.23.1-2.el10_22026-07-06redhat
redhatnodejs:24-9080020260626074955.rhel92026-07-06redhat
redhatcluster-observability-operator/troubleshooting-panel-console-plugin-rhel9:17828394942026-07-01redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
undici—8.5.0—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 65× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-07-27 08:07 UTCVendor advisory
  2. 2026-07-26 19:07 UTCEG score recompute
  3. 2026-07-26 19:07 UTCVendor advisory
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-25 14:17 UTCEPSS rescore
  7. 2026-07-24 14:17 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:05 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:24 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-19 14:30 UTCEPSS rescore
  14. 2026-07-19 02:28 UTCEPSS rescore
  15. 2026-07-18 10:04 UTCEPSS rescore
  16. 2026-07-16 21:43 UTCVendor advisory
  17. 2026-07-16 17:02 UTCEPSS rescore
  18. 2026-07-16 05:28 UTCVendor advisory
  19. 2026-07-15 16:57 UTCEPSS rescore
  20. 2026-07-15 16:26 UTCVendor advisory
  21. 2026-07-15 03:25 UTCVendor advisory
  22. 2026-07-15 02:00 UTCEPSS rescore
  23. 2026-07-14 14:20 UTCVendor advisory
  24. 2026-07-14 01:20 UTCVendor advisory
  25. 2026-07-13 22:30 UTCEPSS rescore
Show 54 more
  1. 2026-07-13 12:19 UTCVendor advisory
  2. 2026-07-13 06:12 UTCEPSS rescore
  3. 2026-07-12 23:18 UTCVendor advisory
  4. 2026-07-12 10:16 UTCVendor advisory
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-11 21:16 UTCVendor advisory
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-11 08:16 UTCVendor advisory
  9. 2026-07-10 19:16 UTCVendor advisory
  10. 2026-07-10 06:16 UTCVendor advisory
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-09 17:04 UTCVendor advisory
  13. 2026-07-09 02:21 UTCVendor advisory
  14. 2026-07-08 15:15 UTCEPSS rescore
  15. 2026-07-08 15:15 UTCEPSS rescore
  16. 2026-07-08 13:20 UTCVendor advisory
  17. 2026-07-08 00:19 UTCVendor advisory
  18. 2026-07-07 13:46 UTCEPSS rescore
  19. 2026-07-07 11:18 UTCVendor advisory
  20. 2026-07-06 21:48 UTCVendor advisory
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 06:36 UTCVendor advisory
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-05 17:36 UTCVendor advisory
  25. 2026-07-05 04:35 UTCVendor advisory
  26. 2026-07-05 02:30 UTCEPSS rescore
  27. 2026-07-05 02:30 UTCEPSS rescore
  28. 2026-07-04 15:22 UTCVendor advisory
  29. 2026-07-04 06:31 UTCEPSS rescore
  30. 2026-07-04 02:11 UTCVendor advisory
  31. 2026-07-03 13:10 UTCVendor advisory
  32. 2026-07-03 00:09 UTCVendor advisory
  33. 2026-07-02 11:09 UTCVendor advisory
  34. 2026-07-01 15:06 UTCEPSS rescore
  35. 2026-07-01 15:06 UTCEPSS rescore
  36. 2026-06-30 23:22 UTCEPSS rescore
  37. 2026-06-29 14:06 UTCEPSS rescore
  38. 2026-06-28 14:07 UTCEPSS rescore
  39. 2026-06-28 04:56 UTCEPSS rescore
  40. 2026-06-28 04:56 UTCEPSS rescore
  41. 2026-06-27 03:08 UTCEPSS rescore
  42. 2026-06-25 13:49 UTCEPSS rescore
  43. 2026-06-24 14:05 UTCEPSS rescore
  44. 2026-06-23 21:32 UTCEPSS rescore
  45. 2026-06-22 14:25 UTCEPSS rescore
  46. 2026-06-22 14:25 UTCEPSS rescore
  47. 2026-06-21 14:56 UTCEPSS rescore
  48. 2026-06-21 14:56 UTCEPSS rescore
  49. 2026-06-21 01:59 UTCEPSS rescore
  50. 2026-06-21 01:59 UTCEPSS rescore
  51. 2026-06-19 19:25 UTCEPSS rescore
  52. 2026-06-18 17:52 UTCEPSS rescore
  53. 2026-06-17 17:53 UTCEG score recompute
  54. 2026-06-17 17:52 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-12151?
CVE-2026-12151 is a high vulnerability published on June 17, 2026. Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size…
When was CVE-2026-12151 disclosed?
CVE-2026-12151 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12151 actively exploited?
CVE-2026-12151 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 47.5% of all scored CVEs.
What is the CVSS score of CVE-2026-12151?
CVE-2026-12151 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-12151?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12151, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-12151

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