CVE-2026-91721

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

Use after free in Internals in Google Chrome prior to 153.0.8010.47 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

CVSS v3
8.8
Vendor severity
CRITICALper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Critical)
EG Score
8.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 15, 2026

Last Modified

September 17, 2026

Advisory Details (2)

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

Chromium

https://issues.chromium.org/issues/557320614
generic

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0541751186.html

Vendor Advisories for CVE-2026-91721(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 39× in last 7d / 112× 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.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-10-04 15:36 UTCVendor advisory
  2. 2026-10-04 15:36 UTCGHSA enrichment
  3. 2026-10-04 03:34 UTCVendor advisory
  4. 2026-10-04 03:33 UTCGHSA enrichment
  5. 2026-10-03 15:31 UTCEG score recompute
  6. 2026-10-03 15:31 UTCVendor advisory
  7. 2026-10-03 15:30 UTCGHSA enrichment
  8. 2026-10-03 03:21 UTCEG score recompute
  9. 2026-10-03 03:21 UTCVendor advisory
  10. 2026-10-03 03:21 UTCGHSA enrichment
  11. 2026-10-02 15:18 UTCVendor advisory
  12. 2026-10-02 15:17 UTCGHSA enrichment
  13. 2026-10-02 03:14 UTCEG score recompute
  14. 2026-10-02 03:14 UTCVendor advisory
  15. 2026-10-02 03:13 UTCGHSA enrichment
  16. 2026-10-01 19:51 UTCEPSS rescore
  17. 2026-10-01 15:10 UTCVendor advisory
  18. 2026-10-01 15:10 UTCGHSA enrichment
  19. 2026-10-01 03:07 UTCVendor advisory
  20. 2026-10-01 03:07 UTCGHSA enrichment
  21. 2026-09-30 15:05 UTCEG score recompute
  22. 2026-09-30 15:05 UTCVendor advisory
  23. 2026-09-30 15:05 UTCGHSA enrichment
  24. 2026-09-30 15:04 UTCEPSS rescore
  25. 2026-09-30 03:02 UTCEG score recompute
Show 75 more
  1. 2026-09-30 03:02 UTCVendor advisory
  2. 2026-09-30 03:02 UTCGHSA enrichment
  3. 2026-09-29 14:59 UTCVendor advisory
  4. 2026-09-29 14:59 UTCGHSA enrichment
  5. 2026-09-29 02:57 UTCEG score recompute
  6. 2026-09-29 02:57 UTCVendor advisory
  7. 2026-09-29 02:57 UTCGHSA enrichment
  8. 2026-09-28 14:54 UTCEG score recompute
  9. 2026-09-28 14:54 UTCVendor advisory
  10. 2026-09-28 14:54 UTCGHSA enrichment
  11. 2026-09-28 13:52 UTCEPSS rescore
  12. 2026-09-28 13:52 UTCEPSS rescore
  13. 2026-09-28 02:51 UTCVendor advisory
  14. 2026-09-28 02:51 UTCGHSA enrichment
  15. 2026-09-27 14:47 UTCEG score recompute
  16. 2026-09-27 14:47 UTCVendor advisory
  17. 2026-09-27 14:47 UTCGHSA enrichment
  18. 2026-09-27 13:49 UTCEPSS rescore
  19. 2026-09-27 02:44 UTCEG score recompute
  20. 2026-09-27 02:44 UTCVendor advisory
  21. 2026-09-27 02:44 UTCGHSA enrichment
  22. 2026-09-26 15:59 UTCEPSS rescore
  23. 2026-09-26 14:40 UTCVendor advisory
  24. 2026-09-26 14:40 UTCGHSA enrichment
  25. 2026-09-26 02:37 UTCEG score recompute
  26. 2026-09-26 02:37 UTCVendor advisory
  27. 2026-09-26 02:37 UTCGHSA enrichment
  28. 2026-09-25 14:34 UTCVendor advisory
  29. 2026-09-25 14:34 UTCGHSA enrichment
  30. 2026-09-25 02:31 UTCVendor advisory
  31. 2026-09-25 02:31 UTCGHSA enrichment
  32. 2026-09-24 14:28 UTCEG score recompute
  33. 2026-09-24 14:28 UTCVendor advisory
  34. 2026-09-24 14:28 UTCGHSA enrichment
  35. 2026-09-24 14:04 UTCEPSS rescore
  36. 2026-09-24 02:24 UTCEG score recompute
  37. 2026-09-24 02:24 UTCVendor advisory
  38. 2026-09-24 02:24 UTCGHSA enrichment
  39. 2026-09-23 17:54 UTCEPSS rescore
  40. 2026-09-23 14:22 UTCVendor advisory
  41. 2026-09-23 14:22 UTCGHSA enrichment
  42. 2026-09-23 02:19 UTCEG score recompute
  43. 2026-09-23 02:19 UTCVendor advisory
  44. 2026-09-23 02:19 UTCGHSA enrichment
  45. 2026-09-22 16:01 UTCEPSS rescore
  46. 2026-09-22 14:16 UTCVendor advisory
  47. 2026-09-22 14:16 UTCGHSA enrichment
  48. 2026-09-22 02:14 UTCEG score recompute
  49. 2026-09-22 02:14 UTCVendor advisory
  50. 2026-09-22 02:14 UTCGHSA enrichment
  51. 2026-09-21 21:09 UTCEPSS rescore
  52. 2026-09-21 14:10 UTCVendor advisory
  53. 2026-09-21 14:10 UTCGHSA enrichment
  54. 2026-09-21 02:07 UTCEG score recompute
  55. 2026-09-21 02:07 UTCVendor advisory
  56. 2026-09-21 02:07 UTCGHSA enrichment
  57. 2026-09-20 20:16 UTCEPSS rescore
  58. 2026-09-20 14:04 UTCVendor advisory
  59. 2026-09-20 14:04 UTCGHSA enrichment
  60. 2026-09-20 02:01 UTCEG score recompute
  61. 2026-09-20 02:01 UTCVendor advisory
  62. 2026-09-20 02:01 UTCGHSA enrichment
  63. 2026-09-19 13:58 UTCVendor advisory
  64. 2026-09-19 13:58 UTCGHSA enrichment
  65. 2026-09-19 01:51 UTCEG score recompute
  66. 2026-09-19 01:51 UTCVendor advisory
  67. 2026-09-19 01:51 UTCGHSA enrichment
  68. 2026-09-18 19:28 UTCEPSS rescore
  69. 2026-09-18 13:48 UTCGHSA enrichment
  70. 2026-09-18 01:45 UTCEG score recompute
  71. 2026-09-18 01:45 UTCGHSA enrichment
  72. 2026-09-17 19:32 UTCEPSS rescore
  73. 2026-09-17 13:42 UTCGHSA enrichment
  74. 2026-09-17 04:21 UTCGHSA enrichment
  75. 2026-09-17 04:06 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91721?
CVE-2026-91721 is a high vulnerability published on September 15, 2026. Use after free in Internals in Google Chrome prior to 153.0.8010.47 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)
When was CVE-2026-91721 disclosed?
CVE-2026-91721 was first published on September 15, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91721 actively exploited?
CVE-2026-91721 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91721?
CVE-2026-91721 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-91721?
No fix for CVE-2026-91721 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-91721 are linked in the Vendor Advisories panel on this page.

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