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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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%
EPSS PROB
0.8%
EPSS %ILE
54th
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
node-undici5.15.0+dfsg1+~cs20.10.9.3-1 ... 8.9.0+dfsg+~cs3.2.0-1 (40 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 (16 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 ... 7.3.0+dfsg1+~cs24.12.11-2 (11 versions)
  • every version up to 8.5.0+dfsg+~cs3.2.0-1: fixed in 8.5.0+dfsg+~cs3.2.0-1
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
undici—
  • every version up to 6.27.0: fixed in 6.27.0
  • 7.0.0 up to 7.28.0: fixed in 7.28.0
  • 8.0.0 up to 8.5.0: fixed in 8.5.0
—

Weakness Classification(2)

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

Additional Vendor Advisories

(7)

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 6× in last 7d / 35× 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 262 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12151?
CVE-2026-12151 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-12151?
A fix for CVE-2026-12151 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-12151 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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

Explore →

Is Your Infrastructure Affected by CVE-2026-12151?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs