CVE-2026-20274

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-02. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:cisco, epss, ghsa
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20274 are related to improper resource control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-664.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Cisco IOS XR Software Security Hardening Release: September 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM

Vendor Advisories for CVE-2026-20274(2)

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 53× in last 7d / 78× 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. 2026-09-11 20:27 UTCGHSA enrichment
  2. 2026-09-11 16:22 UTCEG score recompute
  3. 2026-09-11 16:22 UTCGHSA enrichment
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-11 12:17 UTCEG score recompute
  6. 2026-09-11 12:16 UTCGHSA enrichment
  7. 2026-09-11 09:36 UTCEPSS rescore
  8. 2026-09-11 08:11 UTCGHSA enrichment
  9. 2026-09-11 04:06 UTCGHSA enrichment
  10. 2026-09-11 00:01 UTCGHSA enrichment
  11. 2026-09-10 19:56 UTCGHSA enrichment
  12. 2026-09-10 15:51 UTCGHSA enrichment
  13. 2026-09-10 11:47 UTCEG score recompute
  14. 2026-09-10 11:46 UTCGHSA enrichment
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-10 07:41 UTCGHSA enrichment
  17. 2026-09-10 03:36 UTCGHSA enrichment
  18. 2026-09-09 23:31 UTCGHSA enrichment
  19. 2026-09-09 19:00 UTCEG score recompute
  20. 2026-09-09 19:00 UTCGHSA enrichment
  21. 2026-09-09 15:32 UTCGHSA enrichment
  22. 2026-09-09 11:26 UTCGHSA enrichment
  23. 2026-09-09 07:21 UTCGHSA enrichment
  24. 2026-09-09 03:16 UTCGHSA enrichment
  25. 2026-09-08 23:12 UTCEG score recompute
Show 53 more
  1. 2026-09-08 23:11 UTCGHSA enrichment
  2. 2026-09-08 22:00 UTCEPSS rescore
  3. 2026-09-08 11:16 UTCGHSA enrichment
  4. 2026-09-08 07:10 UTCGHSA enrichment
  5. 2026-09-08 03:06 UTCGHSA enrichment
  6. 2026-09-07 23:01 UTCGHSA enrichment
  7. 2026-09-07 18:56 UTCEG score recompute
  8. 2026-09-07 18:56 UTCGHSA enrichment
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-07 14:51 UTCGHSA enrichment
  11. 2026-09-07 08:43 UTCGHSA enrichment
  12. 2026-09-07 04:34 UTCGHSA enrichment
  13. 2026-09-07 00:29 UTCGHSA enrichment
  14. 2026-09-06 20:25 UTCGHSA enrichment
  15. 2026-09-06 16:20 UTCEG score recompute
  16. 2026-09-06 16:20 UTCGHSA enrichment
  17. 2026-09-06 13:47 UTCEPSS rescore
  18. 2026-09-06 12:15 UTCGHSA enrichment
  19. 2026-09-06 08:06 UTCGHSA enrichment
  20. 2026-09-06 04:01 UTCGHSA enrichment
  21. 2026-09-05 23:57 UTCGHSA enrichment
  22. 2026-09-05 19:52 UTCGHSA enrichment
  23. 2026-09-05 15:48 UTCEG score recompute
  24. 2026-09-05 15:47 UTCGHSA enrichment
  25. 2026-09-05 11:41 UTCGHSA enrichment
  26. 2026-09-05 07:36 UTCGHSA enrichment
  27. 2026-09-05 03:31 UTCGHSA enrichment
  28. 2026-09-04 23:26 UTCGHSA enrichment
  29. 2026-09-04 18:27 UTCGHSA enrichment
  30. 2026-09-04 14:21 UTCEG score recompute
  31. 2026-09-04 14:21 UTCGHSA enrichment
  32. 2026-09-04 13:48 UTCGHSA enrichment
  33. 2026-09-04 09:40 UTCGHSA enrichment
  34. 2026-09-04 05:35 UTCEG score recompute
  35. 2026-09-04 05:35 UTCGHSA enrichment
  36. 2026-09-04 05:06 UTCEPSS rescore
  37. 2026-09-04 01:21 UTCGHSA enrichment
  38. 2026-09-03 21:16 UTCGHSA enrichment
  39. 2026-09-03 17:11 UTCEG score recompute
  40. 2026-09-03 17:11 UTCGHSA enrichment
  41. 2026-09-03 13:05 UTCGHSA enrichment
  42. 2026-09-03 09:00 UTCGHSA enrichment
  43. 2026-09-03 04:56 UTCEG score recompute
  44. 2026-09-03 04:56 UTCGHSA enrichment
  45. 2026-09-03 03:44 UTCGHSA enrichment
  46. 2026-09-02 23:37 UTCGHSA enrichment
  47. 2026-09-02 19:31 UTCGHSA enrichment
  48. 2026-09-02 18:36 UTCEG score recompute
  49. 2026-09-02 18:36 UTCGHSA enrichment
  50. 2026-09-02 18:06 UTCEG score recompute
  51. 2026-09-02 17:37 UTCEG score recompute
  52. 2026-09-02 16:33 UTCEG score recompute
  53. 2026-09-02 16:31 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-20274?
CVE-2026-20274 is a critical vulnerability published on September 2, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The…
When was CVE-2026-20274 disclosed?
CVE-2026-20274 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20274 actively exploited?
CVE-2026-20274 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 50.0% of all scored CVEs.
What is the CVSS score of CVE-2026-20274?
CVE-2026-20274 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-20274?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20274, 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-2026-20274

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