CVE-2026-76243

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.

CVSS v3
9.2
EG Score
9.2(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

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
Severity92% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 19, 2026

Advisory Details (2)

Auto-updated Aug 19, 2026
Patch available. Sources: github.
generic

stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth | Advisories | VulnCheck

https://www.vulncheck.com/advisories/stigmem-before-0a2-authentication-bypass-via-disabled-auth
github Patch Available

Auth-disabled deployments may grant broad anonymous access outside loopback · Advisory · eidetic-labs/stigmem · GitHub

Affected: 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only loc

https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-fp6w-8wpg-74g5

Vendor Advisories for CVE-2026-76243(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 16× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-08-21 06:36 UTCGHSA enrichment
  2. 2026-08-21 02:58 UTCGHSA enrichment
  3. 2026-08-20 23:19 UTCEG score recompute
  4. 2026-08-20 23:19 UTCGHSA enrichment
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 19:41 UTCGHSA enrichment
  7. 2026-08-20 16:03 UTCGHSA enrichment
  8. 2026-08-20 12:24 UTCGHSA enrichment
  9. 2026-08-20 08:46 UTCGHSA enrichment
  10. 2026-08-20 05:08 UTCGHSA enrichment
  11. 2026-08-20 01:30 UTCGHSA enrichment
  12. 2026-08-19 21:51 UTCGHSA enrichment
  13. 2026-08-19 18:12 UTCGHSA enrichment
  14. 2026-08-19 14:26 UTCEG score recompute
  15. 2026-08-19 14:12 UTCEG score recompute
  16. 2026-08-19 14:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76243?
CVE-2026-76243 is a critical vulnerability published on August 19, 2026. stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.
When was CVE-2026-76243 disclosed?
CVE-2026-76243 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76243 actively exploited?
CVE-2026-76243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.6% of all scored CVEs.
What is the CVSS score of CVE-2026-76243?
CVE-2026-76243 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-76243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76243, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-76243

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