CVE-2026-12312

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

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

A fix is available — apply it.

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
—
EPSS
16.7%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 18, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-61/
generic

Security Vulnerabilities fixed in Thunderbird 152 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-60/
generic

Security Vulnerabilities fixed in Firefox ESR 140.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-58/
generic

Security Vulnerabilities fixed in Firefox 152 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-57/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2040383

Vendor Advisories for CVE-2026-12312(20)

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

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatthunderbird-0:140.12.0-1.el9_22026-07-15redhat
redhatthunderbird-0:140.12.0-1.el8_42026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_82026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_62026-07-14redhat
redhatthunderbird-0:140.12.0-1.el9_62026-07-13redhat
redhatfirefox-0:140.12.0-1.el7_92026-07-13redhat
redhatfirefox-0:140.12.0-1.el9_42026-07-13redhat
redhatthunderbird-0:140.12.0-1.el10_02026-07-13redhat
redhatthunderbird-0:140.12.0-1.el9_42026-07-13redhat
redhatfirefox-0:140.12.0-1.el9_62026-07-09redhat
redhatfirefox-0:140.12.0-1.el8_62026-07-09redhat
redhatfirefox-0:140.12.0-1.el8_82026-07-07redhat
redhatfirefox-0:140.12.0-1.el8_42026-07-07redhat
redhatfirefox-0:140.12.0-1.el10_02026-07-07redhat
redhatfirefox-0:140.12.0-1.el9_22026-07-07redhat
redhatthunderbird-0:140.12.0-1.el8_102026-06-30redhat
redhatthunderbird-0:140.12.0-1.el10_22026-06-29redhat
redhatthunderbird-0:140.12.0-1.el9_82026-06-25redhat
redhatfirefox-0:140.12.0-1.el9_82026-06-22redhat
redhatfirefox-0:140.12.0-1.el10_22026-06-22redhat
redhatfirefox-0:140.12.0-1.el8_102026-06-22redhat

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

(1)

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 11× in last 7d / 129× 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 151 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-12312?
CVE-2026-12312 is a high vulnerability published on June 16, 2026. Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
When was CVE-2026-12312 disclosed?
CVE-2026-12312 was first published in the National Vulnerability Database on June 16, 2026, with the most recent update on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12312 actively exploited?
CVE-2026-12312 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12312?
CVE-2026-12312 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12312?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12312, 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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