CVE-2026-7323

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-04-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

A fix is available — apply it.

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

April 28, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Apr 30, 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 Thunderbird 150.0.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-38/
generic

Security Vulnerabilities fixed in Firefox ESR 140.10.1 — Mozilla

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

Security Vulnerabilities fixed in Firefox 150.0.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-35/
generic

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028537%2C2029911%2C2031121%2C2033602

Vendor Advisories for CVE-2026-7323(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_42026-06-09redhat
redhatthunderbird-0:140.10.1-1.el10_02026-06-09redhat
redhatthunderbird-0:140.10.1-1.el8_82026-06-09redhat
redhatthunderbird-0:140.10.1-1.el9_22026-06-09redhat
redhatthunderbird-0:140.10.1-1.el9_42026-06-09redhat
redhatthunderbird-0:140.10.1-1.el9_62026-06-09redhat
redhatfirefox-0:140.10.1-1.el8_62026-06-08redhat
redhatfirefox-0:140.10.1-1.el8_82026-06-03redhat
redhatfirefox-0:140.10.1-1.el8_42026-06-03redhat
redhatfirefox-0:140.10.1-1.el7_92026-06-03redhat
redhatfirefox-0:140.10.1-1.el10_02026-06-02redhat
redhatfirefox-0:140.10.1-1.el9_62026-06-02redhat
redhatfirefox-0:140.10.1-1.el9_22026-06-02redhat
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
redhatfirefox-0:140.10.1-1.el9_82026-05-19redhat
redhatthunderbird-0:140.10.1-1.el10_22026-05-19redhat
redhatthunderbird-0:140.10.1-1.el9_82026-05-19redhat
redhatfirefox-0:140.10.1-1.el10_22026-05-19redhat

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(2)

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 / 31× 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 231 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. 2026-09-04 05:07 UTCEPSS rescore
  8. 2026-09-02 14:12 UTCEPSS rescore
  9. 2026-09-01 13:54 UTCEPSS rescore
  10. 2026-09-01 04:40 UTCEPSS rescore
  11. 2026-09-01 04:40 UTCEPSS rescore
  12. 2026-08-30 19:18 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-28 21:42 UTCEPSS rescore
  16. 2026-08-27 14:25 UTCEPSS rescore
  17. 2026-08-26 14:47 UTCEPSS rescore
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-24 14:18 UTCEPSS rescore
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-20 22:56 UTCEPSS rescore
  23. 2026-08-19 17:04 UTCEPSS rescore
  24. 2026-08-18 13:49 UTCEPSS rescore
  25. 2026-08-18 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 13:58 UTCEG score recompute
  2. 2026-08-17 13:58 UTCVendor advisory
  3. 2026-08-17 13:58 UTCGHSA enrichment
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-16 14:56 UTCEPSS rescore
  6. 2026-08-16 14:56 UTCEPSS rescore
  7. 2026-08-16 05:33 UTCEG score recompute
  8. 2026-08-16 05:33 UTCVendor advisory
  9. 2026-08-16 05:33 UTCGHSA enrichment
  10. 2026-08-16 02:15 UTCEPSS rescore
  11. 2026-08-15 01:31 UTCEPSS rescore
  12. 2026-08-14 18:02 UTCVendor advisory
  13. 2026-08-14 18:02 UTCGHSA enrichment
  14. 2026-08-14 03:59 UTCEG score recompute
  15. 2026-08-14 03:59 UTCVendor advisory
  16. 2026-08-14 03:59 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 08:23 UTCVendor advisory
  19. 2026-08-13 08:23 UTCGHSA enrichment
  20. 2026-08-12 17:38 UTCEG score recompute
  21. 2026-08-12 17:38 UTCVendor advisory
  22. 2026-08-12 17:38 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 16:31 UTCEG score recompute
  25. 2026-08-11 16:31 UTCVendor advisory
  26. 2026-08-11 16:31 UTCGHSA enrichment
  27. 2026-08-11 13:43 UTCEPSS rescore
  28. 2026-08-11 01:57 UTCEG score recompute
  29. 2026-08-11 01:57 UTCVendor advisory
  30. 2026-08-11 01:57 UTCGHSA enrichment
  31. 2026-08-11 00:00 UTCEPSS rescore
  32. 2026-08-10 05:27 UTCVendor advisory
  33. 2026-08-10 05:27 UTCGHSA enrichment
  34. 2026-08-09 16:17 UTCEG score recompute
  35. 2026-08-09 16:17 UTCVendor advisory
  36. 2026-08-09 16:17 UTCGHSA enrichment
  37. 2026-08-09 13:47 UTCEPSS rescore
  38. 2026-08-09 03:08 UTCEG score recompute
  39. 2026-08-09 03:08 UTCVendor advisory
  40. 2026-08-09 03:08 UTCGHSA enrichment
  41. 2026-08-08 16:37 UTCEPSS rescore
  42. 2026-08-08 06:11 UTCVendor advisory
  43. 2026-08-08 06:11 UTCGHSA enrichment
  44. 2026-08-07 17:01 UTCEG score recompute
  45. 2026-08-07 17:01 UTCVendor advisory
  46. 2026-08-07 17:01 UTCGHSA enrichment
  47. 2026-08-07 03:51 UTCEG score recompute
  48. 2026-08-07 03:51 UTCVendor advisory
  49. 2026-08-07 03:51 UTCGHSA enrichment
  50. 2026-08-06 13:47 UTCEPSS rescore
  51. 2026-08-06 11:57 UTCVendor advisory
  52. 2026-08-06 11:57 UTCGHSA enrichment
  53. 2026-08-05 22:46 UTCEG score recompute
  54. 2026-08-05 22:46 UTCVendor advisory
  55. 2026-08-05 22:46 UTCGHSA enrichment
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-05 19:17 UTCEPSS rescore
  58. 2026-08-04 15:10 UTCEPSS rescore
  59. 2026-08-04 10:39 UTCEPSS rescore
  60. 2026-08-03 20:49 UTCEG score recompute
  61. 2026-08-03 20:49 UTCVendor advisory
  62. 2026-08-03 20:49 UTCGHSA enrichment
  63. 2026-08-03 10:36 UTCEPSS rescore
  64. 2026-08-02 19:08 UTCVendor advisory
  65. 2026-08-02 19:08 UTCGHSA enrichment
  66. 2026-08-02 05:58 UTCEG score recompute
  67. 2026-08-02 05:58 UTCVendor advisory
  68. 2026-08-02 05:58 UTCGHSA enrichment
  69. 2026-08-02 02:27 UTCEPSS rescore
  70. 2026-08-01 04:16 UTCEPSS rescore
  71. 2026-07-30 16:28 UTCEPSS rescore
  72. 2026-07-30 01:30 UTCEPSS rescore
  73. 2026-07-28 15:37 UTCEPSS rescore
  74. 2026-07-27 14:14 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-7323?
CVE-2026-7323 is a high vulnerability published on April 28, 2026. Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR…
When was CVE-2026-7323 disclosed?
CVE-2026-7323 was first published in the National Vulnerability Database on April 28, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7323 actively exploited?
CVE-2026-7323 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 69.0% of all scored CVEs.
What is the CVSS score of CVE-2026-7323?
CVE-2026-7323 has a CVSS v3.1 base score of 7.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-7323?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7323, 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-2026-7323

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