CVE-2026-21273

HIGHNVD 8.78.7—
EchelonGraph scoreHIGH confidence

Score 8.7 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. NVD baseline CVSS 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: None knownExposed: 0

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

is affected by an Improper Input Validation vulnerability that could result in privilege escalation. A low-privileged attacker could exploit this vulnerability to gain unauthorized read and write access. Exploitation of this issue requires user interaction in that a victim must open a malicious file. Scope is changed.

CVSS v3
8.7
EG Score
8.7(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity87% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 13, 2026

References (1)

Vendor Advisories for CVE-2026-21273(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 28× in last 7d / 44× 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 01:55 UTCEG score recompute
  2. 2026-08-21 01:55 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:16 UTCGHSA enrichment
  5. 2026-08-20 02:14 UTCEG score recompute
  6. 2026-08-20 02:14 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 14:36 UTCGHSA enrichment
  9. 2026-08-19 02:56 UTCGHSA enrichment
  10. 2026-08-18 15:16 UTCEG score recompute
  11. 2026-08-18 15:16 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 02:42 UTCGHSA enrichment
  14. 2026-08-17 15:05 UTCEG score recompute
  15. 2026-08-17 15:05 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 03:28 UTCGHSA enrichment
  18. 2026-08-16 15:50 UTCEG score recompute
  19. 2026-08-16 15:50 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 04:13 UTCEG score recompute
  22. 2026-08-16 04:13 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 16:36 UTCGHSA enrichment
  25. 2026-08-15 04:59 UTCEG score recompute
Show 19 more
  1. 2026-08-15 04:59 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 17:22 UTCGHSA enrichment
  4. 2026-08-14 05:35 UTCEG score recompute
  5. 2026-08-14 05:35 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 17:58 UTCEG score recompute
  8. 2026-08-13 17:58 UTCGHSA enrichment
  9. 2026-08-13 08:59 UTCGHSA enrichment
  10. 2026-08-12 21:22 UTCEG score recompute
  11. 2026-08-12 21:22 UTCGHSA enrichment
  12. 2026-08-12 15:24 UTCEG score recompute
  13. 2026-08-12 15:24 UTCGHSA enrichment
  14. 2026-08-12 13:50 UTCEPSS rescore
  15. 2026-08-12 06:16 UTCGHSA enrichment
  16. 2026-08-11 18:39 UTCEG score recompute
  17. 2026-08-11 18:39 UTCGHSA enrichment
  18. 2026-08-11 16:46 UTCEG score recompute
  19. 2026-08-11 16:45 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-21273?
CVE-2026-21273 is a high vulnerability published on August 11, 2026. is affected by an Improper Input Validation vulnerability that could result in privilege escalation. A low-privileged attacker could exploit this vulnerability to gain unauthorized read and write access. Exploitation of this issue requires user interaction in that a victim must open a malicious…
When was CVE-2026-21273 disclosed?
CVE-2026-21273 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21273 actively exploited?
CVE-2026-21273 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.6% of all scored CVEs.
What is the CVSS score of CVE-2026-21273?
CVE-2026-21273 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-21273?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21273, 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

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