CVE-2026-53602

MEDIUMPre-NVD 6.96.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (21st 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
6.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.7, two related authorization gaps let a host that should no longer be trusted obtain a fresh, valid Nebula certificate, because nebula-mgmt does not re-evaluate revocation/authorization state at certificate issuance time — only at poll time. Firstly, the blocklist is not enforced at sign / re-enroll time. internal/api/enroll.go:128 calls caMgr.Sign(...) without consulting the blocklist. The blocklist is only checked in the poll path (internal/api/updates.go:57, fingerprintInBlocklist). The blocklist is keyed by certificate fingerprint (internal/store/sqlite.go), so a re-enrollment produces a new fingerprint that is not in the blocklist. Secondly, renewal does not re-validate operator / CA status. Auto-renewal at poll time (internal/api/updates.go:285-319, signHostCert) reads host.Name, host.Groups, host.NebulaIPs from the DB and re-signs without checking whether the owning operator is still active or the CA still valid. DisableOperator (internal/store/sqlite_operators.go) revokes sessions and API keys but does not retire the operator's CAs, and pki/signer.go checks only CA cert time-expiry, not operator/CA status. This issue has been patched in version 0.3.7.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity69% × 45%
The EG Score, 6.9 of 10.
Exploitation0.3% × 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 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 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

July 9, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Sep 4, 2026
Patch available. Sources: github, github_release.
GitHub release Patch Available

v0.3.7

Patch available: forgekeep/nebula-mesh v0.3.7

https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.7
Web page

Security audit — full code review & offensive assessment · Issue #178 · forgekeep/nebula-mesh · GitHub

https://github.com/forgekeep/nebula-mesh/issues/178
GitHub advisoryMentions a patch (unverified)

Host revocation is not durable: blocked/offboarded hosts can regain a valid certificate · Advisory · forgekeep/nebula-mesh · GitHub

https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-339v-266x-79xr

Vendor Advisories for CVE-2026-53602(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/forgekeep/nebula-mesh—
  • every version up to 0.3.7: fixed in 0.3.7
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 33× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-10-12 15:57 UTCEG score recompute
  4. 2026-10-11 19:40 UTCEG score recompute
  5. 2026-10-11 16:55 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  18. 2026-10-01 16:01 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  22. 2026-09-28 10:26 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 21st percentile
Show 27 more
  1. 2026-09-24 11:23 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-09-23 05:53 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-09-18 05:35 UTCEG score recompute
  7. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  9. 2026-09-14 08:51 UTCEG score recompute
  10. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  11. 2026-09-13 08:18 UTCEG score recompute
  12. 2026-09-12 03:22 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  14. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  15. 2026-09-08 22:53 UTCEG score recompute
  16. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  17. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  18. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-09-05 22:32 UTCEG score recompute
  20. 2026-09-04 20:30 UTCEG score recompute
  21. 2026-09-04 20:05 UTCEG score recompute
  22. 2026-09-04 19:45 UTCEG score recomputeFirst assessed: 6.9 MEDIUM
  23. 2026-09-04 19:44 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9
  24. 2026-07-31 23:00 UTCEG score recompute
  25. 2026-07-26 12:17 UTCEG score recompute
  26. 2026-07-23 03:19 UTCEG score recompute
  27. 2026-07-09 21:46 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-53602?
CVE-2026-53602 is a medium-severity vulnerability; its CVE record was published on July 9, 2026. nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.7, two related authorization gaps let a host that should no longer be trusted obtain a fresh, valid Nebula certificate, because nebula-mgmt does not re-evaluate revocation/authorization state at certificate…
When was the CVE record for CVE-2026-53602 published?
The CVE record for CVE-2026-53602 was published on July 9, 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-2026-53602 actively exploited?
CVE-2026-53602 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53602?
CVE-2026-53602 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53602?
A fix for CVE-2026-53602 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53602 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53602

Explore →

Is Your Infrastructure Affected by CVE-2026-53602?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs