CVE-2026-49494

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-07. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

Xcitium Client Security (XCS) before 13.8.2.10019 and Comodo Internet Security (CIS) through 12.3.4.8162 (fix expected by 2026 Q3) contain an integer underflow vulnerability in the firewall driver Inspect.sys that allows remote unauthenticated attackers to crash the system by sending a crafted IPv6 packet with a declared payload length smaller than the sum of its extension-header lengths. The unsigned 64-bit payload-length value underflows to a near-maximal integer, triggering an out-of-bounds read and oversized memcpy in the Windows kernel at DISPATCH_LEVEL, resulting in a blue screen of death even on hosts with all ports blocked.

CVSS v3
7.5
EG Score
7.5(high)
EPSS
41.6%
KEV
Not listed

Published

June 7, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jun 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Comodo Internet Security Inspect.sys IPv6 Integer Underflow Remote Denial of Service | Advisories | VulnCheck

https://www.vulncheck.com/advisories/comodo-internet-security-inspect-sys-ipv6-integer-underflow-remote-denial-of-service
generic

GitHub - MalwareTech/ComoDoS: A remote denial-of-service zero day vulnerability in Comodo Internet Security firewall · GitHub

https://github.com/MalwareTech/ComoDoS

Vendor Advisories for CVE-2026-49494(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 24× in last 7d / 143× 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 143 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-49494?
CVE-2026-49494 is a high vulnerability published on June 7, 2026. Xcitium Client Security (XCS) before 13.8.2.10019 and Comodo Internet Security (CIS) through 12.3.4.8162 (fix expected by 2026 Q3) contain an integer underflow vulnerability in the firewall driver Inspect.sys that allows remote unauthenticated attackers to crash the system by sending a crafted IPv6…
When was CVE-2026-49494 disclosed?
CVE-2026-49494 was first published in the National Vulnerability Database on June 7, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49494 actively exploited?
CVE-2026-49494 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 41.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49494?
CVE-2026-49494 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-49494?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49494, 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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