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
Trending — 3 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

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

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
8.1(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
30%
KEV
Not listed

Published

June 16, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
No patch confirmed 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 6× in last 7d / 37× 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 229 total refreshes for this CVE.

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

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 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-2026-12326 actively exploited?
CVE-2026-12326 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 69.9% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12326, 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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