CVE-2026-37236

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — Patch released this week

Also known asEUVD-2026-67776 (ENISA EUVD) · GHSA-6gx8-r37x-4vw8 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
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: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-www-form-urlencoded includes this header, the request method is rewritten to an arbitrary attacker-supplied value before routing. This allows bypassing method-based access controls enforced by upstream proxies or WAFs.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 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
0.4%
EPSS %ILE
37th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). 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: 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.

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

August 28, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Oct 31, 2026
Patch available. Sources: github_commit.
Web page

CVE-2026-37236 · s00me00ne

https://s00me00ne.com/cve/cve-2026-37236/
GitHub commit

commit 72123cd4f325 (grpc-ecosystem/grpc-gateway)

Fix landed in grpc-ecosystem/grpc-gateway commit 72123cd4f325 — awaiting tagged release

https://github.com/grpc-ecosystem/grpc-gateway/commit/72123cd4f32545f6e1376873f412dcdcbcf29acc
Web page

GitHub - grpc-ecosystem/grpc-gateway: gRPC to JSON proxy generator following the gRPC HTTP spec · GitHub

https://github.com/grpc-ecosystem/grpc-gateway

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhacm2/acm-grafana-rhel9:17928654872026-10-29redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-grpc-ecosystem-grpc-gateway1.16.0-1 ... 2.30.0-1 (11 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-grpc-ecosystem-grpc-gateway2.20.0-2, 2.27.2-1, 2.27.2-2, 2.27.2-3, 2.30.0-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-grpc-ecosystem-grpc-gateway2.20.0-2, 2.27.2-1, 2.27.2-2, 2.27.2-3
  • every version up to 2.30.0-1: fixed in 2.30.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 167× 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 100 of 483 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. None are among the latest 100 rows. The 383 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-31 06:13 UTCEG score recompute
  2. 2026-10-31 06:13 UTCVendor advisory
  3. 2026-10-31 06:13 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-10-30 07:06 UTCEG score recompute
  6. 2026-10-30 07:06 UTCVendor advisory
  7. 2026-10-30 07:06 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-10-29 07:58 UTCEG score recompute
  10. 2026-10-29 07:58 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-10-28 08:50 UTCEG score recompute
  13. 2026-10-28 08:50 UTCVendor advisory
  14. 2026-10-28 08:50 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-10-27 09:11 UTCEG score recompute
  17. 2026-10-27 09:11 UTCVendor advisory
  18. 2026-10-27 09:11 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  20. 2026-10-26 09:16 UTCEG score recompute
  21. 2026-10-26 09:16 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  23. 2026-10-25 14:32 UTCEG score recompute
  24. 2026-10-25 10:08 UTCEG score recompute
  25. 2026-10-25 10:08 UTCVendor advisory
Show 75 more
  1. 2026-10-25 10:08 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-24 10:59 UTCEG score recompute
  4. 2026-10-24 10:58 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-10-23 11:48 UTCEG score recompute
  7. 2026-10-23 11:48 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-22 12:37 UTCEG score recompute
  10. 2026-10-22 12:37 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-21 13:29 UTCEG score recompute
  13. 2026-10-21 13:29 UTCVendor advisory
  14. 2026-10-21 13:29 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-10-20 14:22 UTCEG score recompute
  17. 2026-10-20 14:21 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-19 13:23 UTCEG score recompute
  20. 2026-10-19 13:23 UTCVendor advisory
  21. 2026-10-19 13:23 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-10-18 12:52 UTCVendor advisory
  24. 2026-10-18 12:52 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-18 03:44 UTCEG score recompute
  26. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  27. 2026-10-17 13:44 UTCEG score recompute
  28. 2026-10-17 13:43 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  30. 2026-10-16 14:34 UTCEG score recompute
  31. 2026-10-16 14:34 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  33. 2026-10-15 15:15 UTCEG score recompute
  34. 2026-10-15 15:15 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  36. 2026-10-14 09:39 UTCEG score recompute
  37. 2026-10-14 09:39 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  39. 2026-10-13 07:23 UTCEG score recompute
  40. 2026-10-13 07:23 UTCVendor advisory
  41. 2026-10-13 07:23 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  43. 2026-10-12 16:11 UTCEG score recompute
  44. 2026-10-12 08:15 UTCVendor advisory
  45. 2026-10-12 08:14 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-11 19:53 UTCEG score recompute
  47. 2026-10-11 17:06 UTCEG score recompute
  48. 2026-10-11 14:33 UTCEG score recompute
  49. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  50. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  51. 2026-10-10 16:00 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-10 11:00 UTCVendor advisory
  53. 2026-10-10 11:00 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-10 06:02 UTCVendor advisory
  55. 2026-10-10 06:02 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-10-10 01:39 UTCEG score recompute
  57. 2026-10-10 01:39 UTCVendor advisory
  58. 2026-10-10 01:39 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  60. 2026-10-09 07:14 UTCVendor advisory
  61. 2026-10-09 07:14 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-10-09 02:49 UTCEG score recompute
  63. 2026-10-09 02:49 UTCVendor advisory
  64. 2026-10-09 02:49 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  66. 2026-10-08 09:54 UTCVendor advisory
  67. 2026-10-08 09:53 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-10-08 05:29 UTCVendor advisory
  69. 2026-10-08 05:29 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-10-08 01:06 UTCEG score recompute
  71. 2026-10-08 01:06 UTCVendor advisory
  72. 2026-10-08 01:06 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  74. 2026-10-07 10:24 UTCVendor advisory
  75. 2026-10-07 10:24 UTCGHSA enrichmentGHSA-6gx8-r37x-4vw8 · GitHub severity CRITICAL · GitHub CVSS 9.8

Frequently asked(5)

What is CVE-2026-37236?
CVE-2026-37236 is a critical-severity vulnerability; its CVE record was published on August 28, 2026. grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-www-form-urlencoded includes this header, the request method is…
When was the CVE record for CVE-2026-37236 published?
The CVE record for CVE-2026-37236 was published on August 28, 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 8, 2026; the record at its source may have been updated since.
Is CVE-2026-37236 actively exploited?
CVE-2026-37236 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-37236?
CVE-2026-37236 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-37236?
A fix for CVE-2026-37236 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-37236 are linked in the Vendor Advisories panel on this page.

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