CVE-2026-87491

CRITICALPre-NVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-09), indicating real-world exploitation has been confirmed by US federal agencies. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa-adp, cisa_kev, epss, ghsa
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 3%CVSS: 8.8Exploit: cisa kev · ssvc active · public exploitExposed: 0

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

Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
8.8
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
3%
EPSS %ILE
87%
KEV
⚠ Exploited

Published

September 9, 2026

Last Modified

September 21, 2026

Advisory Details (2)

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

Chromium

https://issues.chromium.org/issues/543557673
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html

Vendor Advisories for CVE-2026-87491(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 95× in last 7d / 222× 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 222 total refreshes for this CVE.

  1. 2026-09-25 14:55 UTCCISA KEV update
  2. 2026-09-25 11:09 UTCGHSA enrichment
  3. 2026-09-25 06:53 UTCVendor advisory
  4. 2026-09-25 06:53 UTCGHSA enrichment
  5. 2026-09-25 02:38 UTCVendor advisory
  6. 2026-09-25 02:38 UTCGHSA enrichment
  7. 2026-09-24 22:22 UTCVendor advisory
  8. 2026-09-24 22:22 UTCGHSA enrichment
  9. 2026-09-24 19:31 UTCCISA KEV update
  10. 2026-09-24 18:06 UTCEG score recompute
  11. 2026-09-24 18:06 UTCVendor advisory
  12. 2026-09-24 18:06 UTCGHSA enrichment
  13. 2026-09-24 14:04 UTCEPSS rescore
  14. 2026-09-24 13:50 UTCVendor advisory
  15. 2026-09-24 13:50 UTCGHSA enrichment
  16. 2026-09-24 09:34 UTCVendor advisory
  17. 2026-09-24 09:34 UTCGHSA enrichment
  18. 2026-09-24 05:18 UTCVendor advisory
  19. 2026-09-24 05:18 UTCGHSA enrichment
  20. 2026-09-24 01:02 UTCVendor advisory
  21. 2026-09-24 01:02 UTCGHSA enrichment
  22. 2026-09-23 20:47 UTCEG score recompute
  23. 2026-09-23 20:47 UTCVendor advisory
  24. 2026-09-23 20:47 UTCGHSA enrichment
  25. 2026-09-23 17:54 UTCEPSS rescore
Show 75 more
  1. 2026-09-23 16:31 UTCVendor advisory
  2. 2026-09-23 16:31 UTCGHSA enrichment
  3. 2026-09-23 12:15 UTCVendor advisory
  4. 2026-09-23 12:15 UTCGHSA enrichment
  5. 2026-09-23 07:59 UTCVendor advisory
  6. 2026-09-23 07:59 UTCGHSA enrichment
  7. 2026-09-23 03:43 UTCVendor advisory
  8. 2026-09-23 03:43 UTCGHSA enrichment
  9. 2026-09-22 23:27 UTCVendor advisory
  10. 2026-09-22 23:27 UTCGHSA enrichment
  11. 2026-09-22 19:36 UTCCISA KEV update
  12. 2026-09-22 19:11 UTCEG score recompute
  13. 2026-09-22 19:11 UTCVendor advisory
  14. 2026-09-22 19:11 UTCGHSA enrichment
  15. 2026-09-22 16:01 UTCEPSS rescore
  16. 2026-09-22 14:56 UTCVendor advisory
  17. 2026-09-22 14:56 UTCGHSA enrichment
  18. 2026-09-22 10:40 UTCVendor advisory
  19. 2026-09-22 10:40 UTCGHSA enrichment
  20. 2026-09-22 06:24 UTCVendor advisory
  21. 2026-09-22 06:24 UTCGHSA enrichment
  22. 2026-09-22 02:08 UTCVendor advisory
  23. 2026-09-22 02:08 UTCGHSA enrichment
  24. 2026-09-21 21:51 UTCEG score recompute
  25. 2026-09-21 21:51 UTCVendor advisory
  26. 2026-09-21 21:51 UTCGHSA enrichment
  27. 2026-09-21 21:09 UTCEPSS rescore
  28. 2026-09-21 19:09 UTCCISA KEV update
  29. 2026-09-21 17:36 UTCVendor advisory
  30. 2026-09-21 17:36 UTCGHSA enrichment
  31. 2026-09-21 13:19 UTCVendor advisory
  32. 2026-09-21 13:19 UTCGHSA enrichment
  33. 2026-09-21 12:55 UTCVendor advisory
  34. 2026-09-21 12:55 UTCGHSA enrichment
  35. 2026-09-21 09:21 UTCVendor advisory
  36. 2026-09-21 09:21 UTCGHSA enrichment
  37. 2026-09-21 05:05 UTCVendor advisory
  38. 2026-09-21 05:05 UTCGHSA enrichment
  39. 2026-09-21 00:49 UTCVendor advisory
  40. 2026-09-21 00:49 UTCGHSA enrichment
  41. 2026-09-20 20:33 UTCVendor advisory
  42. 2026-09-20 20:33 UTCGHSA enrichment
  43. 2026-09-20 16:17 UTCVendor advisory
  44. 2026-09-20 16:17 UTCGHSA enrichment
  45. 2026-09-20 12:02 UTCVendor advisory
  46. 2026-09-20 12:01 UTCGHSA enrichment
  47. 2026-09-20 07:45 UTCVendor advisory
  48. 2026-09-20 07:45 UTCGHSA enrichment
  49. 2026-09-20 03:27 UTCVendor advisory
  50. 2026-09-20 03:27 UTCGHSA enrichment
  51. 2026-09-19 23:12 UTCVendor advisory
  52. 2026-09-19 23:12 UTCGHSA enrichment
  53. 2026-09-19 18:56 UTCEG score recompute
  54. 2026-09-19 18:56 UTCVendor advisory
  55. 2026-09-19 18:56 UTCGHSA enrichment
  56. 2026-09-19 14:40 UTCVendor advisory
  57. 2026-09-19 14:40 UTCGHSA enrichment
  58. 2026-09-19 10:24 UTCVendor advisory
  59. 2026-09-19 10:24 UTCGHSA enrichment
  60. 2026-09-19 06:07 UTCVendor advisory
  61. 2026-09-19 06:07 UTCGHSA enrichment
  62. 2026-09-19 01:51 UTCVendor advisory
  63. 2026-09-19 01:51 UTCGHSA enrichment
  64. 2026-09-18 21:36 UTCEG score recompute
  65. 2026-09-18 21:36 UTCVendor advisory
  66. 2026-09-18 21:36 UTCGHSA enrichment
  67. 2026-09-18 19:28 UTCEPSS rescore
  68. 2026-09-18 19:20 UTCCISA KEV update
  69. 2026-09-18 17:20 UTCVendor advisory
  70. 2026-09-18 17:20 UTCGHSA enrichment
  71. 2026-09-18 14:15 UTCCISA KEV update
  72. 2026-09-18 13:04 UTCVendor advisory
  73. 2026-09-18 13:03 UTCGHSA enrichment
  74. 2026-09-18 08:47 UTCVendor advisory
  75. 2026-09-18 08:47 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCSneakyNachos/CVE-2026-87491-and-CVE-2026-85046-the-bagel-fell-off-the-counter
    First seen Sep 10, 2026
    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-87491?
CVE-2026-87491 is a critical vulnerability published on September 9, 2026. Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-87491 disclosed?
CVE-2026-87491 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87491 actively exploited?
Yes. CISA added CVE-2026-87491 to the Known Exploited Vulnerabilities catalog on September 9, 2026, affecting Google Chromium V8. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-87491?
CVE-2026-87491 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-87491?
CVE-2026-87491 affects Google Chromium V8. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-87491?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87491, 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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