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 46% 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
55%
KEV
Not listed

Published

June 17, 2026

Last Modified

September 11, 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(20)

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

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatundici2026-09-10redhat
redhatrhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9:17878015272026-09-08redhat
redhatdevspaces/pluginregistry-rhel9:17877597232026-09-01redhat
redhatrhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9:17871213872026-08-27redhat
redhatodf4/rook-ceph-rhel9-operator:17866295482026-08-19redhat
redhatodf4/rook-ceph-rhel9-operator:17867031432026-08-18redhat
redhatodf4/rook-ceph-rhel9-operator:17867068802026-08-18redhat
redhatnodejs:22-9060020260804140259.rhel92026-08-10redhat
redhatopenshift4/ose-monitoring-plugin-rhel9:17847448592026-08-06redhat
redhatcryostat/cryostat-grafana-dashboard-rhel9:4.2.0-132026-07-29redhat
redhatdevspaces/code-rhel9:17852457772026-07-29redhat
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
redhatrhdh/rhdh-hub-rhel9:17834481842026-07-08redhat
redhatdevspaces/pluginregistry-rhel9:17829893672026-07-08redhat
redhatnodejs:24-9080020260626074955.rhel92026-07-06redhat
redhatnodejs:22-9080020260626075442.rhel92026-07-06redhat
redhatnodejs22-1:22.23.1-2.el10_22026-07-06redhat
redhatnodejs24-1:24.18.0-1.el10_22026-07-06redhat
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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-undici5.15.0+dfsg1+~cs20.10.9.3-1 ... 8.9.0+dfsg+~cs3.2.0-1 (39 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-undici7.15.0+dfsg+~cs3.2.0-1 ... 8.9.0+dfsg+~cs3.2.0-1 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-undici7.15.0+dfsg+~cs3.2.0-1 ... 7.3.0+dfsg1+~cs24.12.11-2 (11 versions)8.5.0+dfsg+~cs3.2.0-1—
npm(1)
PackageVulnerable rangeFixed inDependents
undici—8.5.0—

Weakness Classification(2)

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

Additional Vendor Advisories

(6)

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 8× in last 7d / 75× 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.

Showing the most recent 100 of 253 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-16 05:14 UTCEPSS rescore
  3. 2026-09-14 03:13 UTCEG score recompute
  4. 2026-09-14 03:13 UTCVendor advisory
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-13 14:13 UTCEG score recompute
  7. 2026-09-13 14:13 UTCVendor advisory
  8. 2026-09-12 15:00 UTCEPSS rescore
  9. 2026-09-11 14:52 UTCEPSS rescore
  10. 2026-09-11 13:24 UTCEG score recompute
  11. 2026-09-11 13:24 UTCVendor advisory
  12. 2026-09-11 12:20 UTCEG score recompute
  13. 2026-09-11 12:20 UTCVendor advisory
  14. 2026-09-11 09:36 UTCEPSS rescore
  15. 2026-09-10 13:22 UTCEG score recompute
  16. 2026-09-10 13:22 UTCVendor advisory
  17. 2026-09-10 12:25 UTCEG score recompute
  18. 2026-09-10 12:25 UTCVendor advisory
  19. 2026-09-10 09:34 UTCEPSS rescore
  20. 2026-09-09 13:40 UTCEG score recompute
  21. 2026-09-09 13:40 UTCVendor advisory
  22. 2026-09-09 12:38 UTCEG score recompute
  23. 2026-09-09 12:38 UTCVendor advisory
  24. 2026-09-08 22:00 UTCEPSS rescore
  25. 2026-09-07 16:01 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-04 13:29 UTCEG score recompute
  3. 2026-09-04 13:29 UTCVendor advisory
  4. 2026-09-04 12:20 UTCEG score recompute
  5. 2026-09-04 12:20 UTCVendor advisory
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-02 14:11 UTCEPSS rescore
  8. 2026-09-02 13:37 UTCEG score recompute
  9. 2026-09-02 13:37 UTCVendor advisory
  10. 2026-09-02 12:37 UTCEG score recompute
  11. 2026-09-02 12:37 UTCVendor advisory
  12. 2026-09-01 13:53 UTCEPSS rescore
  13. 2026-09-01 04:39 UTCEPSS rescore
  14. 2026-08-31 13:31 UTCEG score recompute
  15. 2026-08-31 13:31 UTCVendor advisory
  16. 2026-08-31 12:30 UTCEG score recompute
  17. 2026-08-31 12:30 UTCVendor advisory
  18. 2026-08-30 21:21 UTCEG score recompute
  19. 2026-08-30 21:21 UTCVendor advisory
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:21 UTCEPSS rescore
  22. 2026-08-28 21:40 UTCEPSS rescore
  23. 2026-08-28 16:46 UTCEG score recompute
  24. 2026-08-28 16:46 UTCVendor advisory
  25. 2026-08-28 15:59 UTCEG score recompute
  26. 2026-08-28 15:59 UTCVendor advisory
  27. 2026-08-27 14:24 UTCEPSS rescore
  28. 2026-08-25 13:48 UTCEPSS rescore
  29. 2026-08-25 02:31 UTCEG score recompute
  30. 2026-08-25 02:31 UTCVendor advisory
  31. 2026-08-24 13:29 UTCEG score recompute
  32. 2026-08-24 13:29 UTCVendor advisory
  33. 2026-08-24 12:20 UTCEG score recompute
  34. 2026-08-24 12:20 UTCVendor advisory
  35. 2026-08-24 06:51 UTCVendor advisory
  36. 2026-08-23 17:19 UTCVendor advisory
  37. 2026-08-23 04:19 UTCEG score recompute
  38. 2026-08-23 04:19 UTCVendor advisory
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-21 23:48 UTCEPSS rescore
  41. 2026-08-21 18:28 UTCVendor advisory
  42. 2026-08-21 05:25 UTCEG score recompute
  43. 2026-08-21 05:25 UTCVendor advisory
  44. 2026-08-20 22:55 UTCEPSS rescore
  45. 2026-08-20 13:57 UTCEG score recompute
  46. 2026-08-20 13:57 UTCVendor advisory
  47. 2026-08-20 12:42 UTCEG score recompute
  48. 2026-08-20 12:42 UTCVendor advisory
  49. 2026-08-20 08:13 UTCEG score recompute
  50. 2026-08-20 08:13 UTCVendor advisory
  51. 2026-08-19 17:03 UTCEPSS rescore
  52. 2026-08-19 12:26 UTCEG score recompute
  53. 2026-08-19 12:26 UTCVendor advisory
  54. 2026-08-19 12:10 UTCEG score recompute
  55. 2026-08-19 12:10 UTCVendor advisory
  56. 2026-08-19 08:10 UTCEG score recompute
  57. 2026-08-19 08:10 UTCVendor advisory
  58. 2026-08-18 13:48 UTCEPSS rescore
  59. 2026-08-17 12:19 UTCEG score recompute
  60. 2026-08-17 12:19 UTCVendor advisory
  61. 2026-08-17 12:12 UTCEG score recompute
  62. 2026-08-17 12:12 UTCVendor advisory
  63. 2026-08-17 02:51 UTCEG score recompute
  64. 2026-08-17 02:51 UTCVendor advisory
  65. 2026-08-16 14:56 UTCEPSS rescore
  66. 2026-08-16 13:51 UTCEG score recompute
  67. 2026-08-16 13:51 UTCVendor advisory
  68. 2026-08-16 02:14 UTCEPSS rescore
  69. 2026-08-16 00:50 UTCVendor advisory
  70. 2026-08-15 11:50 UTCEG score recompute
  71. 2026-08-15 11:50 UTCVendor advisory
  72. 2026-08-15 01:30 UTCEPSS rescore
  73. 2026-08-14 22:49 UTCVendor advisory
  74. 2026-08-14 09:49 UTCEG score recompute
  75. 2026-08-14 09:49 UTCVendor advisory

Related CVEs(same vendor + same CWE)

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 September 11, 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 45.3% 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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