CVE-2026-34334

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-12. The CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
7.8EG
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: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.2%
EPSS %ILE
11th
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 (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade 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; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

May 12, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated May 12, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34334

Vendor Advisories for CVE-2026-34334(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 32× 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 98 of 296 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 198 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-10-18 03:46 UTCEG score recompute
  5. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-10-17 15:38 UTCEG score recompute
  7. 2026-10-17 15:38 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  9. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  10. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  11. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  12. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  13. 2026-10-12 16:12 UTCEG score recompute
  14. 2026-10-11 19:54 UTCEG score recompute
  15. 2026-10-11 17:08 UTCEG score recompute
  16. 2026-10-11 14:35 UTCEG score recompute
  17. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  25. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 10th percentile
Show 73 more
  1. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  3. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  5. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  7. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  12. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  13. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  14. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  15. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  19. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  20. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  21. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  22. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  24. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  26. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  27. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  28. 2026-08-23 18:19 UTCEG score recompute
  29. 2026-08-23 18:19 UTCVendor advisory
  30. 2026-08-23 18:19 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  31. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  32. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  33. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  34. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  35. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  36. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  37. 2026-08-17 10:52 UTCEG score recompute
  38. 2026-08-17 10:52 UTCVendor advisory
  39. 2026-08-17 10:52 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  40. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  41. 2026-08-16 04:14 UTCEG score recompute
  42. 2026-08-16 04:14 UTCVendor advisory
  43. 2026-08-16 04:14 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  45. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  46. 2026-08-14 15:36 UTCVendor advisory
  47. 2026-08-14 15:36 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  48. 2026-08-14 02:45 UTCEG score recompute
  49. 2026-08-14 02:45 UTCVendor advisory
  50. 2026-08-14 02:45 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  52. 2026-08-13 05:56 UTCVendor advisory
  53. 2026-08-13 05:56 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  54. 2026-08-12 16:14 UTCEG score recompute
  55. 2026-08-12 16:14 UTCVendor advisory
  56. 2026-08-12 16:14 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  57. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  58. 2026-08-11 18:50 UTCEG score recompute
  59. 2026-08-11 18:50 UTCVendor advisory
  60. 2026-08-11 18:49 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-08-11 04:21 UTCEG score recompute
  62. 2026-08-11 04:21 UTCVendor advisory
  63. 2026-08-11 04:21 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  64. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  65. 2026-08-10 15:30 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-08-10 03:46 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  67. 2026-08-09 14:56 UTCEG score recompute
  68. 2026-08-09 14:56 UTCVendor advisory
  69. 2026-08-09 14:56 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8
  70. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  71. 2026-08-09 02:05 UTCEG score recompute
  72. 2026-08-09 02:05 UTCVendor advisory
  73. 2026-08-09 02:05 UTCGHSA enrichmentGHSA-48gq-9w8x-r7fj · GitHub severity HIGH · GitHub CVSS 7.8

Frequently asked(5)

What is CVE-2026-34334?
CVE-2026-34334 is a high-severity vulnerability; its CVE record was published on May 12, 2026. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
When was CVE-2026-34334 made public?
CVE-2026-34334 was made public on May 12, 2026: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on May 12, 2026. EchelonGraph's copy of the record carries a last-modified date of August 10, 2026; the record at its source may have been updated since.
Is CVE-2026-34334 actively exploited?
CVE-2026-34334 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34334?
CVE-2026-34334 has a CVSS base score of 7.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-34334?
A fix for CVE-2026-34334 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-34334 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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