CVE-2026-12328

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

June 16, 2026

Last Modified

July 15, 2026

Advisory Details (4)

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

Security Vulnerabilities fixed in Firefox ESR 115.37 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-59/
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

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029402%2C2038477%2C2039726%2C2041373%2C2042268%2C2042451%2C2042782%2C2042858%2C2042929%2C2042965%2C2043213

Vendor Advisories for CVE-2026-12328(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_82026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_62026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_42026-07-14redhat
redhatfirefox-0:140.12.0-1.el7_92026-07-13redhat
redhatthunderbird-0:140.12.0-1.el9_42026-07-13redhat
redhatthunderbird-0:140.12.0-1.el9_62026-07-13redhat
redhatfirefox-0:140.12.0-1.el9_42026-07-13redhat
redhatthunderbird-0:140.12.0-1.el10_02026-07-13redhat
redhatfirefox-0:140.12.0-1.el8_62026-07-09redhat
redhatfirefox-0:140.12.0-1.el9_62026-07-09redhat
redhatfirefox-0:140.12.0-1.el9_22026-07-07redhat
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.el8_82026-07-07redhat
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.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (279 versions)140.12.0esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (330 versions)1:140.12.0esr-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (186 versions)140.12.0esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (215 versions)1:140.12.0esr-1~deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (62 versions)140.12.0esr-1~deb13u1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (71 versions)1:140.12.0esr-1~deb13u1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (63 versions)140.12.0esr-1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (72 versions)1:140.12.0esr-1—

Weakness Classification(2)

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 26× in last 7d / 141× 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 297 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12328?
CVE-2026-12328 is a high vulnerability published on June 16, 2026. Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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…
When was CVE-2026-12328 disclosed?
CVE-2026-12328 was first published in the National Vulnerability Database on June 16, 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-2026-12328 actively exploited?
CVE-2026-12328 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 61.0% of all scored CVEs.
What is the CVSS score of CVE-2026-12328?
CVE-2026-12328 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12328?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12328, 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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