CVE-2026-59818

HIGHNVD 8.18.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.4% (37th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-42426 (ENISA EUVD)Source: ENISA EUVD

8.1EG
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: 0.4%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 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.
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
0.4%
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 (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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, 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; 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.

The score's inputs: 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

July 8, 2026

Last Modified

October 25, 2026

Advisory Details (9)

Auto-updated Jul 8, 2026
Patch available. Sources: github_release, github, github_pr, github_commit.
GitHub release Patch Available

v3.6.13

Patch available: etcd-io/etcd v3.6.13

https://github.com/etcd-io/etcd/releases/tag/v3.6.13
GitHub release Patch Available

v3.5.32

Patch available: etcd-io/etcd v3.5.32

https://github.com/etcd-io/etcd/releases/tag/v3.5.32
GitHub commit

commit 8221ae82bc25 (etcd-io/etcd)

Fix landed in etcd-io/etcd commit 8221ae82bc25 — awaiting tagged release

https://github.com/etcd-io/etcd/commit/8221ae82bc25d4d55ca64382207b69be71038cbb
GitHub commit

commit 24838af5a53d (etcd-io/etcd)

Fix landed in etcd-io/etcd commit 24838af5a53d — awaiting tagged release

https://github.com/etcd-io/etcd/commit/24838af5a53dd0245adced920e42a9bf0e7a267f
GitHub commit

commit 2308ce157806 (etcd-io/etcd)

Fix landed in etcd-io/etcd commit 2308ce157806 — awaiting tagged release

https://github.com/etcd-io/etcd/commit/2308ce1578064641d4d67c40f0487309267d1bef
GitHub pull request

[release-3.6] Reject the client request if the client certificate has been revoked

Fix merged in etcd-io/etcd PR #22025 on 2026-07-01 — awaiting tagged release

https://github.com/etcd-io/etcd/pull/22025
GitHub pull request

[release-3.5] Reject the client request if the client certificate has been revoked

Fix merged in etcd-io/etcd PR #22021 on 2026-07-01 — awaiting tagged release

https://github.com/etcd-io/etcd/pull/22021
GitHub pull request

Reject the client request if the client certificate has been revoked

Fix merged in etcd-io/etcd PR #22007 on 2026-07-01 — awaiting tagged release

https://github.com/etcd-io/etcd/pull/22007
GitHub advisoryMentions a patch (unverified)

etcd: CRL enforcement bypass on gRPC listener when `--listen-client-http-urls` is configured · Advisory · etcd-io/etcd · GitHub

https://github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92

Vendor Advisories for CVE-2026-59818(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatetcd-main-3.7.1-0.1.hum12026-07-24redhat

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

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
etcd3.5.16-10 ... 3.5.30-2 (13 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
etcd3.5.16-10 ... 3.5.30-2 (13 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 43× 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 238 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 138 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-11-01 10:38 UTCEG score recompute
  3. 2026-11-01 10:38 UTCVendor advisory
  4. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-25 17:27 UTCEG score recompute
  11. 2026-10-25 17:27 UTCVendor advisory
  12. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-25 14:16 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-20 09:38 UTCEG score recompute
  20. 2026-10-20 09:38 UTCVendor advisory
  21. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-18 03:27 UTCEG score recompute
  24. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
Show 75 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-13 15:51 UTCEG score recompute
  5. 2026-10-13 15:51 UTCVendor advisory
  6. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-12 15:52 UTCEG score recompute
  8. 2026-10-11 19:36 UTCEG score recompute
  9. 2026-10-11 16:51 UTCEG score recompute
  10. 2026-10-11 14:13 UTCEG score recompute
  11. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-10-01 16:09 UTCEG score recompute
  23. 2026-10-01 16:09 UTCVendor advisory
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  25. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  26. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  27. 2026-09-28 13:20 UTCEG score recompute
  28. 2026-09-28 13:20 UTCVendor advisory
  29. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  30. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  31. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  32. 2026-09-24 11:44 UTCEG score recompute
  33. 2026-09-24 11:44 UTCVendor advisory
  34. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  35. 2026-09-23 06:03 UTCEG score recompute
  36. 2026-09-23 06:03 UTCVendor advisory
  37. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  38. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  39. 2026-09-18 05:40 UTCEG score recompute
  40. 2026-09-18 05:40 UTCVendor advisory
  41. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  42. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  43. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  44. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  45. 2026-09-13 23:48 UTCEG score recompute
  46. 2026-09-13 23:48 UTCVendor advisory
  47. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  48. 2026-09-13 08:22 UTCVendor advisory
  49. 2026-09-12 15:29 UTCEG score recompute
  50. 2026-09-12 15:29 UTCVendor advisory
  51. 2026-09-12 03:30 UTCEG score recompute
  52. 2026-09-12 03:30 UTCVendor advisory
  53. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  54. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  55. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  56. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  57. 2026-09-06 14:02 UTCEG score recompute
  58. 2026-09-06 14:02 UTCVendor advisory
  59. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  60. 2026-09-05 22:45 UTCEG score recompute
  61. 2026-09-05 22:45 UTCVendor advisory
  62. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  63. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  64. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  65. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  66. 2026-08-30 19:27 UTCEG score recompute
  67. 2026-08-30 19:27 UTCVendor advisory
  68. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  69. 2026-08-30 07:28 UTCEG score recompute
  70. 2026-08-30 07:28 UTCVendor advisory
  71. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  72. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  73. 2026-08-27 21:48 UTCEG score recompute
  74. 2026-08-27 21:48 UTCVendor advisory
  75. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 35th percentile

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:44868

Frequently asked(5)

What is CVE-2026-59818?
CVE-2026-59818 is a high-severity vulnerability; its CVE record was published on July 8, 2026. etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the…
When was the CVE record for CVE-2026-59818 published?
The CVE record for CVE-2026-59818 was published on July 8, 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 October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-59818 actively exploited?
CVE-2026-59818 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-2026-59818?
CVE-2026-59818 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-59818?
A fix for CVE-2026-59818 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59818 are linked in the Vendor Advisories panel on this page.

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