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 71% 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
29%
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 18× in last 7d / 97× 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 207 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 UTCGHSA enrichment
  4. 2026-08-23 21:10 UTCGHSA enrichment
  5. 2026-08-23 09:27 UTCEG score recompute
  6. 2026-08-23 09:27 UTCGHSA enrichment
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-21 23:48 UTCEPSS rescore
  9. 2026-08-21 19:52 UTCGHSA enrichment
  10. 2026-08-21 08:09 UTCEG score recompute
  11. 2026-08-21 08:09 UTCGHSA enrichment
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-20 20:23 UTCGHSA enrichment
  14. 2026-08-20 08:34 UTCEG score recompute
  15. 2026-08-20 08:34 UTCGHSA enrichment
  16. 2026-08-19 17:03 UTCEPSS rescore
  17. 2026-08-19 13:08 UTCEG score recompute
  18. 2026-08-19 13:08 UTCGHSA enrichment
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 09:48 UTCGHSA enrichment
  21. 2026-08-16 22:06 UTCEG score recompute
  22. 2026-08-16 22:06 UTCGHSA enrichment
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 10:22 UTCEG score recompute
  25. 2026-08-16 10:22 UTCGHSA enrichment
Show 75 more
  1. 2026-08-16 02:14 UTCEPSS rescore
  2. 2026-08-15 22:40 UTCGHSA enrichment
  3. 2026-08-15 10:08 UTCEG score recompute
  4. 2026-08-15 10:08 UTCGHSA enrichment
  5. 2026-08-15 01:30 UTCEPSS rescore
  6. 2026-08-14 19:44 UTCGHSA enrichment
  7. 2026-08-14 08:01 UTCEG score recompute
  8. 2026-08-14 08:01 UTCGHSA enrichment
  9. 2026-08-13 22:00 UTCEPSS rescore
  10. 2026-08-13 20:18 UTCGHSA enrichment
  11. 2026-08-13 06:07 UTCGHSA enrichment
  12. 2026-08-12 18:23 UTCEG score recompute
  13. 2026-08-12 18:23 UTCGHSA enrichment
  14. 2026-08-12 13:50 UTCEPSS rescore
  15. 2026-08-12 06:37 UTCGHSA enrichment
  16. 2026-08-11 18:51 UTCEG score recompute
  17. 2026-08-11 18:51 UTCGHSA enrichment
  18. 2026-08-11 13:42 UTCEPSS rescore
  19. 2026-08-11 07:08 UTCEG score recompute
  20. 2026-08-11 07:08 UTCGHSA enrichment
  21. 2026-08-10 23:59 UTCEPSS rescore
  22. 2026-08-10 19:25 UTCGHSA enrichment
  23. 2026-08-10 04:48 UTCGHSA enrichment
  24. 2026-08-09 17:05 UTCEG score recompute
  25. 2026-08-09 17:05 UTCGHSA enrichment
  26. 2026-08-09 13:46 UTCEPSS rescore
  27. 2026-08-09 05:23 UTCGHSA enrichment
  28. 2026-08-08 17:40 UTCEG score recompute
  29. 2026-08-08 17:40 UTCGHSA enrichment
  30. 2026-08-08 16:37 UTCEPSS rescore
  31. 2026-08-08 05:57 UTCGHSA enrichment
  32. 2026-08-07 18:14 UTCEG score recompute
  33. 2026-08-07 18:14 UTCGHSA enrichment
  34. 2026-08-07 06:31 UTCGHSA enrichment
  35. 2026-08-06 18:48 UTCEG score recompute
  36. 2026-08-06 18:48 UTCGHSA enrichment
  37. 2026-08-06 13:46 UTCEPSS rescore
  38. 2026-08-06 07:05 UTCGHSA enrichment
  39. 2026-08-05 19:22 UTCEG score recompute
  40. 2026-08-05 19:22 UTCGHSA enrichment
  41. 2026-08-05 19:17 UTCEPSS rescore
  42. 2026-08-04 15:37 UTCEG score recompute
  43. 2026-08-04 15:37 UTCGHSA enrichment
  44. 2026-08-04 15:09 UTCEPSS rescore
  45. 2026-08-04 10:38 UTCEPSS rescore
  46. 2026-08-03 20:38 UTCEG score recompute
  47. 2026-08-03 20:38 UTCGHSA enrichment
  48. 2026-08-03 10:35 UTCEPSS rescore
  49. 2026-08-03 08:54 UTCGHSA enrichment
  50. 2026-08-02 19:32 UTCGHSA enrichment
  51. 2026-08-02 07:49 UTCEG score recompute
  52. 2026-08-02 07:49 UTCGHSA enrichment
  53. 2026-08-02 02:26 UTCEPSS rescore
  54. 2026-08-01 20:05 UTCGHSA enrichment
  55. 2026-08-01 08:22 UTCEG score recompute
  56. 2026-08-01 08:22 UTCGHSA enrichment
  57. 2026-08-01 04:15 UTCEPSS rescore
  58. 2026-07-31 13:10 UTCGHSA enrichment
  59. 2026-07-30 23:35 UTCEG score recompute
  60. 2026-07-30 23:35 UTCGHSA enrichment
  61. 2026-07-30 16:27 UTCEPSS rescore
  62. 2026-07-30 04:22 UTCEG score recompute
  63. 2026-07-30 04:22 UTCGHSA enrichment
  64. 2026-07-30 01:30 UTCEPSS rescore
  65. 2026-07-29 14:46 UTCGHSA enrichment
  66. 2026-07-29 03:03 UTCEG score recompute
  67. 2026-07-29 03:03 UTCGHSA enrichment
  68. 2026-07-28 15:36 UTCEPSS rescore
  69. 2026-07-28 01:38 UTCEG score recompute
  70. 2026-07-28 01:38 UTCGHSA enrichment
  71. 2026-07-27 14:13 UTCEPSS rescore
  72. 2026-07-27 07:39 UTCGHSA enrichment
  73. 2026-07-26 19:52 UTCEG score recompute
  74. 2026-07-26 19:52 UTCGHSA enrichment
  75. 2026-07-26 14:54 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 71.0% 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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