CVE-2026-7321

CRITICALNVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-28. NVD baseline CVSS 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

A fix is available — apply it.

Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.

CVSS v3
9.6
EG Score
9.6(medium)
EPSS
17.2%
KEV
Not listed

Published

April 28, 2026

Last Modified

May 1, 2026

Advisory Details (2)

Auto-updated Apr 28, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox ESR 140.10.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-36/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2029461

Vendor Advisories for CVE-2026-7321(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatthunderbird-0:140.10.1-1.el8_62026-06-10redhat
redhatthunderbird-0:140.10.1-1.el8_82026-06-09redhat
redhatthunderbird-0:140.10.1-1.el10_02026-06-09redhat
redhatthunderbird-0:140.10.1-1.el8_42026-06-09redhat
redhatthunderbird-0:140.10.1-1.el9_62026-06-09redhat
redhatthunderbird-0:140.10.1-1.el9_42026-06-09redhat
redhatthunderbird-0:140.10.1-1.el9_22026-06-09redhat
redhatfirefox-0:140.10.1-1.el8_62026-06-08redhat
redhatfirefox-0:140.10.1-1.el7_92026-06-03redhat
redhatfirefox-0:140.10.1-1.el8_42026-06-03redhat
redhatfirefox-0:140.10.1-1.el8_82026-06-03redhat
redhatfirefox-0:140.10.1-1.el9_22026-06-02redhat
redhatfirefox-0:140.10.1-1.el9_62026-06-02redhat
redhatfirefox-0:140.10.1-1.el10_02026-06-02redhat
redhatfirefox-0:140.10.1-1.el9_42026-06-01redhat
redhatfirefox-0:140.10.1-1.el9_02026-05-28redhat
redhatthunderbird-0:140.10.1-1.el8_102026-05-26redhat
redhatfirefox-0:140.10.1-1.el8_102026-05-20redhat
redhatthunderbird-0:140.10.1-1.el10_22026-05-19redhat
redhatfirefox-0:140.10.1-1.el10_22026-05-19redhat
redhatfirefox-0:140.10.1-1.el9_82026-05-19redhat
redhatthunderbird-0:140.10.1-1.el9_82026-05-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 42× 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 269 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-7321?
CVE-2026-7321 is a critical vulnerability published on April 28, 2026. Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
When was CVE-2026-7321 disclosed?
CVE-2026-7321 was first published in the National Vulnerability Database on April 28, 2026, with the most recent update on May 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7321 actively exploited?
CVE-2026-7321 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7321?
CVE-2026-7321 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-7321?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7321, 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-2026-7321

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