CVE-2026-12290

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
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Memory safety bug fixed in Firefox 152. 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
8.1HIGHmedium 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
31st
KEV
Not listed

Published

June 16, 2026

Last Modified

July 15, 2026

Advisory Details (6)

Auto-updated Jun 18, 2026
Patch available.
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 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

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2024852

Vendor Advisories for CVE-2026-12290(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 / EcosystemFix (by version range) / 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.el10_02026-07-13redhat
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.el9_42026-07-13redhat
redhatthunderbird-0:140.12.0-1.el9_62026-07-13redhat
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.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.el8_102026-06-22redhat
redhatfirefox-0:140.12.0-1.el9_82026-06-22redhat
redhatfirefox-0:140.12.0-1.el10_22026-06-22redhat

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 rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (279 versions)
  • every version up to 140.12.0esr-1~deb11u1: fixed in 140.12.0esr-1~deb11u1
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (330 versions)
  • every version up to 1:140.12.0esr-1~deb11u1: fixed in 1:140.12.0esr-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (186 versions)
  • every version up to 140.12.0esr-1~deb12u1: fixed in 140.12.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (215 versions)
  • every version up to 1:140.12.0esr-1~deb12u1: fixed in 1:140.12.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (62 versions)
  • every version up to 140.12.0esr-1~deb13u1: fixed in 140.12.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (71 versions)
  • every version up to 1:140.12.0esr-1~deb13u1: fixed in 1:140.12.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (63 versions)
  • every version up to 140.12.0esr-1: fixed in 140.12.0esr-1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (72 versions)
  • every version up to 1:140.12.0esr-1: fixed in 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 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 338 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 03:33 UTCEG score recompute
  18. 2026-09-14 03:33 UTCVendor advisory
  19. 2026-09-14 03:33 UTCGHSA enrichment
  20. 2026-09-13 16:46 UTCEPSS rescore
  21. 2026-09-12 15:00 UTCEPSS rescore
  22. 2026-09-11 14:52 UTCEPSS rescore
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-10 09:34 UTCEPSS rescore
  25. 2026-09-08 22:00 UTCEPSS rescore
Show 75 more
  1. 2026-09-07 16:01 UTCEPSS rescore
  2. 2026-09-06 13:47 UTCEPSS rescore
  3. 2026-09-04 05:06 UTCEPSS rescore
  4. 2026-09-02 14:11 UTCEPSS rescore
  5. 2026-09-01 13:53 UTCEPSS rescore
  6. 2026-09-01 04:39 UTCEPSS rescore
  7. 2026-08-30 22:50 UTCEG score recompute
  8. 2026-08-30 22:50 UTCVendor advisory
  9. 2026-08-30 22:50 UTCGHSA enrichment
  10. 2026-08-30 19:17 UTCEPSS rescore
  11. 2026-08-30 01:21 UTCEPSS rescore
  12. 2026-08-28 21:40 UTCEPSS rescore
  13. 2026-08-27 14:24 UTCEPSS rescore
  14. 2026-08-25 13:48 UTCEPSS rescore
  15. 2026-08-24 23:26 UTCEG score recompute
  16. 2026-08-24 23:26 UTCVendor advisory
  17. 2026-08-24 23:26 UTCGHSA enrichment
  18. 2026-08-23 20:59 UTCVendor advisory
  19. 2026-08-23 20:59 UTCGHSA enrichment
  20. 2026-08-23 09:29 UTCEG score recompute
  21. 2026-08-23 09:29 UTCVendor advisory
  22. 2026-08-23 09:29 UTCGHSA enrichment
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-21 23:48 UTCEPSS rescore
  25. 2026-08-21 19:14 UTCVendor advisory
  26. 2026-08-21 19:14 UTCGHSA enrichment
  27. 2026-08-21 07:44 UTCEG score recompute
  28. 2026-08-21 07:44 UTCVendor advisory
  29. 2026-08-21 07:44 UTCGHSA enrichment
  30. 2026-08-20 22:55 UTCEPSS rescore
  31. 2026-08-20 20:14 UTCVendor advisory
  32. 2026-08-20 20:14 UTCGHSA enrichment
  33. 2026-08-20 08:34 UTCEG score recompute
  34. 2026-08-20 08:34 UTCVendor advisory
  35. 2026-08-20 08:34 UTCGHSA enrichment
  36. 2026-08-19 17:03 UTCEPSS rescore
  37. 2026-08-19 13:08 UTCEG score recompute
  38. 2026-08-19 13:08 UTCVendor advisory
  39. 2026-08-19 13:08 UTCGHSA enrichment
  40. 2026-08-18 13:48 UTCEPSS rescore
  41. 2026-08-17 09:32 UTCVendor advisory
  42. 2026-08-17 09:32 UTCGHSA enrichment
  43. 2026-08-16 22:03 UTCEG score recompute
  44. 2026-08-16 22:03 UTCVendor advisory
  45. 2026-08-16 22:03 UTCGHSA enrichment
  46. 2026-08-16 14:56 UTCEPSS rescore
  47. 2026-08-16 10:19 UTCEG score recompute
  48. 2026-08-16 10:19 UTCVendor advisory
  49. 2026-08-16 10:19 UTCGHSA enrichment
  50. 2026-08-16 02:14 UTCEPSS rescore
  51. 2026-08-15 22:50 UTCVendor advisory
  52. 2026-08-15 22:50 UTCGHSA enrichment
  53. 2026-08-15 10:08 UTCEG score recompute
  54. 2026-08-15 10:08 UTCVendor advisory
  55. 2026-08-15 10:08 UTCGHSA enrichment
  56. 2026-08-15 01:30 UTCEPSS rescore
  57. 2026-08-14 21:57 UTCVendor advisory
  58. 2026-08-14 21:57 UTCGHSA enrichment
  59. 2026-08-14 10:28 UTCVendor advisory
  60. 2026-08-14 10:28 UTCGHSA enrichment
  61. 2026-08-13 22:58 UTCEG score recompute
  62. 2026-08-13 22:58 UTCVendor advisory
  63. 2026-08-13 22:58 UTCGHSA enrichment
  64. 2026-08-13 22:00 UTCEPSS rescore
  65. 2026-08-13 11:28 UTCVendor advisory
  66. 2026-08-13 11:28 UTCGHSA enrichment
  67. 2026-08-12 23:58 UTCEG score recompute
  68. 2026-08-12 23:58 UTCVendor advisory
  69. 2026-08-12 23:58 UTCGHSA enrichment
  70. 2026-08-12 13:50 UTCEPSS rescore
  71. 2026-08-12 12:29 UTCVendor advisory
  72. 2026-08-12 12:29 UTCGHSA enrichment
  73. 2026-08-12 00:50 UTCEG score recompute
  74. 2026-08-12 00:50 UTCVendor advisory
  75. 2026-08-12 00:50 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-12290?
CVE-2026-12290 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, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
When was CVE-2026-12290 disclosed?
CVE-2026-12290 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-2026-12290 actively exploited?
CVE-2026-12290 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12290?
CVE-2026-12290 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12290?
A fix for CVE-2026-12290 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-12290 are linked in the Vendor Advisories panel on this page.

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