CVE-2026-73459

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. a secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

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

On affected platforms running Arista EOS with IS-IS configured, an unauthenticated attacker who can inject a specially crafted IS-IS LSP PDU can cause the legitimate LSP to be unexpectedly purged from the IS-IS link-state database. This may result in traffic loss.

CVSS v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

Security Advisory 0160 - Arista

https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160

Vendor Advisories for CVE-2026-73459(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 20× in last 7d / 20× 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. 2026-09-19 05:38 UTCEG score recompute
  2. 2026-09-19 05:38 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 18:20 UTCGHSA enrichment
  5. 2026-09-18 07:01 UTCGHSA enrichment
  6. 2026-09-17 19:42 UTCEG score recompute
  7. 2026-09-17 19:42 UTCGHSA enrichment
  8. 2026-09-17 08:23 UTCGHSA enrichment
  9. 2026-09-16 21:02 UTCEG score recompute
  10. 2026-09-16 21:02 UTCGHSA enrichment
  11. 2026-09-16 19:44 UTCEG score recompute
  12. 2026-09-16 19:44 UTCGHSA enrichment
  13. 2026-09-16 19:12 UTCEG score recompute
  14. 2026-09-16 19:12 UTCGHSA enrichment
  15. 2026-09-16 14:08 UTCEPSS rescore
  16. 2026-09-16 11:45 UTCEG score recompute
  17. 2026-09-16 11:45 UTCGHSA enrichment
  18. 2026-09-16 00:25 UTCEG score recompute
  19. 2026-09-15 23:23 UTCEG score recompute
  20. 2026-09-15 23:22 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-73459?
CVE-2026-73459 is a high vulnerability published on September 15, 2026. On affected platforms running Arista EOS with IS-IS configured, an unauthenticated attacker who can inject a specially crafted IS-IS LSP PDU can cause the legitimate LSP to be unexpectedly purged from the IS-IS link-state database. This may result in traffic loss.
When was CVE-2026-73459 disclosed?
CVE-2026-73459 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73459 actively exploited?
CVE-2026-73459 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 94.0% of all scored CVEs.
What is the CVSS score of CVE-2026-73459?
CVE-2026-73459 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-73459?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73459, 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-2026-73459

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