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
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: None knownExposed: 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)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

April 28, 2026

Last Modified

May 1, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.10.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-39/
generic

Security Vulnerabilities fixed in Firefox ESR 140.10.1 — Mozilla

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

Security Vulnerabilities fixed in Thunderbird 150 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-33/
generic

Security Vulnerabilities fixed in Firefox 150 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-30/
generic

2029461 - (CVE-2026-7321) Integer truncation in r_strdup leads to heap OOB read in Socket process via PMediaTransport::CreateIceCtx

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.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (267 versions)140.10.1esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (318 versions)1:140.10.1esr-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (174 versions)140.10.1esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (203 versions)1:140.10.1esr-1~deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (50 versions)140.10.1esr-1~deb13u1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (59 versions)1:140.10.1esr-1~deb13u1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (51 versions)140.10.1esr-1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (60 versions)1:140.10.1esr-1—

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 5× in last 7d / 32× 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 379 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 82.4% of all scored CVEs.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-7321

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