CVE-2026-12326

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 70% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: cisa-adp, epss, ghsa
8.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Memory safety bugs present in 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 and Thunderbird 152.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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%
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

Published

June 16, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
No fix on record yet.
generic

Security Vulnerabilities fixed in Thunderbird 152 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-60/
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=2039050%2C2042718%2C2042760%2C2044831%2C2045307%2C2045398%2C2045516%2C2045572%2C2041741%2C2044433
generic

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021955%2C2025960%2C2029066%2C2029403%2C2029435%2C2029803%2C2030570%2C2030573%2C2032264%2C2033234%2C2034816%2C2035907%2C2035963%2C2036895%2C2036898%2C2036907%2C2036909%2C2036928%2C2036931%2C2036932%2C2036934%2C2039238%2C2039463
generic

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1767455%2C2004308%2C2024445%2C2028182%2C2029765%2C2029883%2C2030110%2C2030149%2C2030366%2C2030374%2C2030564%2C2031120%2C2033411%2C2038695%2C2042465%2C2042781%2C2042907

Vendor Advisories for CVE-2026-12326(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 23× 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 243 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12326?
CVE-2026-12326 is a high vulnerability published on June 16, 2026. Memory safety bugs present in 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 and Thunderbird 152.
When was CVE-2026-12326 disclosed?
CVE-2026-12326 was first published 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-2026-12326 actively exploited?
CVE-2026-12326 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12326?
CVE-2026-12326 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12326?
No fix for CVE-2026-12326 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-12326 are linked in the Vendor Advisories panel on this page.

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