etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, unauthorized users may bypass authentication or authorization checks and call certain etcd functions in clusters that expose the gRPC API to untrusted or partially trusted clients. In unpatched etcd clusters with etcd auth enabled, unauthorized users are able to call MemberList and learn cluster topology, including member IDs and advertised endpoints; call Alarm, which can be abused for operational disruption or denial of service; use Lease APIs, interfering with TTL-based keys and lease ownership; and/or trigger compaction, permanently removing historical revisions and disrupting watch, audit, and recovery workflows. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and/or require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.
CVE-2026-33413
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (17th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-16191 (ENISA EUVD) · GHSA-q8m4-xhhv-38mg (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 8.8
- EG Score
- 8.8HIGHmedium confidence
- EG Risk
- 55EG Risk 55/100
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)Severity88% × 45%Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.3% × 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 partial (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
- 0.3%
- EPSS %ILE
- 17th
- 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 (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.8 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
- 0.3% 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 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 partial (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; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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
March 26, 2026
Last Modified
June 17, 2026
Advisory Details (1)
Auto-updated Aug 2, 2026Authorization bypasses in multiple APIs · Advisory · etcd-io/etcd · GitHub
https://github.com/etcd-io/etcd/security/advisories/GHSA-q8m4-xhhv-38mgVendor Advisories for CVE-2026-33413(6)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:54757Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 security advisory
- RHSA-2026:28047Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (etcd) security update
- RHSA-2026:23345Red Hat Product SecurityHigh
Red Hat Security Advisory: Multicluster Global Hub 1.6.2 security update
- RHSA-2026:22347Red Hat Product SecurityHigh
Red Hat Security Advisory: Multicluster Global Hub 1.4.5 security update
- CVE-2026-33413Microsoft Security Response Center (MSRC)High
etcd: Authorization bypasses in multiple APIs
- RHSA-2026:21769Red Hat Product SecurityHigh
Red Hat Security Advisory: Multicluster Global Hub 1.5.4 security update
Patch Availability(9)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | etcd-0:3.3.23-22.el8ost | 2026-08-13 | redhat |
| redhat | etcd-0:3.4.26-9.5.el9ost | 2026-06-22 | redhat |
| redhat | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1780167118 | 2026-06-04 | redhat |
| redhat | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779579439 | 2026-06-01 | redhat |
| redhat | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1778867753 | 2026-05-28 | redhat |
| go | go.etcd.io/etcd | — | ghsa |
| go | go.etcd.io/etcd/v3 @ 3.4.42 (fixes <= 3.4.41) | — | ghsa |
| go | go.etcd.io/etcd/v3 @ 3.5.28 (fixes >= 3.5.0-alpha.0, <= 3.5.27) | — | ghsa |
| go | go.etcd.io/etcd/v3 @ 3.6.9 (fixes >= 3.6.0-alpha.0, <= 3.6.8) | — | ghsa |
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
(6 across 5 ecosystems)
Go(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| go.etcd.io/etcd | — |
| — |
| go.etcd.io/etcd/v3 | — |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| etcd | 3.3.25+dfsg-6 ... 3.5.5-1 (36 versions) |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| etcd | 3.4.23-4 ... 3.5.5-1 (30 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| etcd | 3.5.16-10 ... 3.5.30-2 (13 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| etcd | 3.5.16-10 ... 3.5.16-9 (7 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 45× 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 96 of 131 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. 4 repeat rows among the latest 100 are merged into the row they repeat. The 35 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-11-01 08:28 UTCVendor advisory
- 2026-11-01 08:28 UTCGHSA enrichmentGHSA-q8m4-xhhv-38mg · GitHub severity HIGH
- 2026-11-01 07:53 UTCGHSA enrichmentGHSA-q8m4-xhhv-38mg · GitHub severity HIGH
- 2026-11-01 07:53 UTCEG score recompute
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
- 2026-10-25 14:34 UTCEG score recompute
- 2026-10-25 00:07 UTCEG score recompute
- 2026-10-25 00:07 UTCVendor advisory
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-18 03:46 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-17 15:45 UTCEG score recompute
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- 2026-10-17 15:45 UTCVendor advisory
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-12 16:13 UTCEG score recompute
- 2026-10-11 19:55 UTCEG score recompute
- 2026-10-11 17:09 UTCEG score recompute
- 2026-10-11 14:36 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-11 05:25 UTCOSV refresh
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-21 17:19 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-02 13:57 UTCOSV refresh
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-16 10:09 UTCEG score recompute
- 2026-08-16 10:09 UTCVendor advisory
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-14 19:27 UTCVendor advisory
- 2026-08-14 06:27 UTCEG score recompute
- 2026-08-14 06:27 UTCVendor advisory
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-12 20:44 UTCEG score recompute
- 2026-08-12 20:44 UTCVendor advisory
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 16th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownGo:go.etcd.io/etcd · Go:go.etcd.io/etcd/v3
Same vendor
10 shownredhat:RHSA-2026:21769
Frequently asked(5)
What is CVE-2026-33413?
When was the CVE record for CVE-2026-33413 published?
Is CVE-2026-33413 actively exploited?
What is the CVSS score of CVE-2026-33413?
How do I remediate CVE-2026-33413?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33413
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