CVE-2026-12329

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

June 16, 2026

Last Modified

July 15, 2026

Advisory Details (3)

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

Security Vulnerabilities fixed in Thunderbird 140.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-61/
generic

Security Vulnerabilities fixed in Firefox ESR 140.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-58/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2044738

Vendor Advisories for CVE-2026-12329(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_62026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_42026-07-14redhat
redhatthunderbird-0:140.12.0-1.el8_82026-07-14redhat
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.el10_02026-07-13redhat
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_82026-07-07redhat
redhatfirefox-0:140.12.0-1.el10_02026-07-07redhat
redhatfirefox-0:140.12.0-1.el8_42026-07-07redhat
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.el10_22026-06-22redhat
redhatfirefox-0:140.12.0-1.el8_102026-06-22redhat
redhatfirefox-0:140.12.0-1.el9_82026-06-22redhat

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(3)

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 9× in last 7d / 44× 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 227 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12329?
CVE-2026-12329 is a medium vulnerability published on June 16, 2026. Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.
When was CVE-2026-12329 disclosed?
CVE-2026-12329 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-2026-12329 actively exploited?
CVE-2026-12329 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 75.8% of all scored CVEs.
What is the CVSS score of CVE-2026-12329?
CVE-2026-12329 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12329?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12329, 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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