CVE-2026-19202

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (13th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-84951 (ENISA EUVD) · GHSA-jcjp-gr26-563j (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A caching flaw in the toolbox-core package of the mcp-toolbox-sdk-python SDK causes the same Google ID token to be cached and reused across different audiences. If an application uses the SDK to authenticate to two or more different audiences within the same process, the module-level token cache fails to key its cached tokens by the requested audience. Consequently, a valid, unexpired token minted for a sensitive service (Service A) can be retrieved from the cache and sent to a secondary service (Service B). An attacker who operates, compromises, or monitors traffic to Service B can capture this token and replay it to impersonate the victim application against Service A.

CVSS
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 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.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
13th
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days 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 low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

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

September 22, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 22, 2026
Patch available. Sources: github_pr.
GitHub pull request Patch Available

fix(toolbox-core): cache Google ID tokens per audience to prevent cross-audience token reuse

Patch available: googleapis/mcp-toolbox-sdk-python toolbox-core-v1.2.0 (PR #675 merged 2026-06-05)

https://github.com/googleapis/mcp-toolbox-sdk-python/pull/675

Vendor Advisories for CVE-2026-19202(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 13× in last 7d / 61× 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 → 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.

Showing the most recent 100 of 256 rows 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. None are among the latest 100 rows. The 156 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 02:41 UTCEchelonGraph re-scored
  2. 2026-11-13 02:41 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  3. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  4. 2026-11-12 04:01 UTCEchelonGraph re-scored
  5. 2026-11-12 04:01 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  6. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  7. 2026-11-11 05:21 UTCEchelonGraph re-scored
  8. 2026-11-11 05:21 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  9. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-11-10 06:40 UTCEchelonGraph re-scored
  11. 2026-11-10 06:40 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  12. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-11-09 08:00 UTCEchelonGraph re-scored
  14. 2026-11-09 08:00 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  15. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-11-08 09:20 UTCEchelonGraph re-scored
  17. 2026-11-08 09:20 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  18. 2026-11-07 10:39 UTCEchelonGraph re-scored
  19. 2026-11-07 10:39 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  20. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  21. 2026-11-06 11:58 UTCEchelonGraph re-scored
  22. 2026-11-06 11:58 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  23. 2026-11-06 02:25 UTCOSV refresh
  24. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-11-05 13:18 UTCEchelonGraph re-scored
Show 75 more
  1. 2026-11-05 13:18 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  2. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-11-04 14:38 UTCEchelonGraph re-scored
  4. 2026-11-04 14:38 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  5. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-11-03 15:57 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  7. 2026-11-02 17:17 UTCEchelonGraph re-scored
  8. 2026-11-02 17:17 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  9. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-11-01 18:36 UTCEchelonGraph re-scored
  11. 2026-11-01 18:36 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  12. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-10-31 19:56 UTCEchelonGraph re-scored
  14. 2026-10-31 19:55 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  15. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-10-30 21:15 UTCEchelonGraph re-scored
  17. 2026-10-30 21:15 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  18. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-10-29 22:35 UTCEchelonGraph re-scored
  20. 2026-10-29 22:35 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  21. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-10-28 23:54 UTCEchelonGraph re-scored
  23. 2026-10-28 23:54 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  24. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-10-28 01:14 UTCEchelonGraph re-scored
  26. 2026-10-28 01:14 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  27. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-10-27 02:30 UTCEchelonGraph re-scored
  29. 2026-10-27 02:29 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  30. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  31. 2026-10-25 23:46 UTCEchelonGraph re-scored
  32. 2026-10-25 23:46 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  33. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  34. 2026-10-25 14:44 UTCEchelonGraph re-scored
  35. 2026-10-25 00:55 UTCEchelonGraph re-scored
  36. 2026-10-25 00:55 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  37. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-10-24 02:15 UTCEchelonGraph re-scored
  39. 2026-10-24 02:15 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  40. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  41. 2026-10-23 03:35 UTCEchelonGraph re-scored
  42. 2026-10-23 03:35 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  43. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  44. 2026-10-22 04:54 UTCEchelonGraph re-scored
  45. 2026-10-22 04:53 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  46. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-10-21 06:08 UTCEchelonGraph re-scored
  48. 2026-10-21 06:08 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  49. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-10-20 07:27 UTCEchelonGraph re-scored
  51. 2026-10-20 07:27 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  52. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  53. 2026-10-19 08:45 UTCEchelonGraph re-scored
  54. 2026-10-19 08:44 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  55. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  56. 2026-10-18 10:03 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  57. 2026-10-18 03:58 UTCEchelonGraph re-scored
  58. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-10-17 06:41 UTCEchelonGraph re-scored
  60. 2026-10-17 06:41 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  61. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  62. 2026-10-16 07:57 UTCEchelonGraph re-scored
  63. 2026-10-16 07:57 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  64. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  65. 2026-10-15 06:58 UTCEchelonGraph re-scored
  66. 2026-10-15 06:58 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  67. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  68. 2026-10-14 02:47 UTCEchelonGraph re-scored
  69. 2026-10-14 02:47 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  70. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  71. 2026-10-12 22:54 UTCEchelonGraph re-scored
  72. 2026-10-12 22:53 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL
  73. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  74. 2026-10-12 16:26 UTCEchelonGraph re-scored
  75. 2026-10-12 02:52 UTCGHSA enrichmentGHSA-jcjp-gr26-563j · GitHub severity CRITICAL

Frequently asked(5)

What is CVE-2026-19202?
CVE-2026-19202 is a critical-severity vulnerability; its CVE record was published on September 22, 2026. A caching flaw in the toolbox-core package of the mcp-toolbox-sdk-python SDK causes the same Google ID token to be cached and reused across different audiences. If an application uses the SDK to authenticate to two or more different audiences within the same process, the module-level token cache…
When was the CVE record for CVE-2026-19202 published?
The CVE record for CVE-2026-19202 was published on September 22, 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 September 23, 2026; the record at its source may have been updated since.
Is CVE-2026-19202 actively exploited?
CVE-2026-19202 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19202?
CVE-2026-19202 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19202?
A fix for CVE-2026-19202 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19202 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-19202

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