CVE-2026-8975

HIGHPre-NVD 8.89.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-19. NVD baseline CVSS 8.8; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3
8.8
EG Score
9.8(medium)
EPSS
35.0%
KEV
Not listed

Published

May 19, 2026

Last Modified

July 15, 2026

Advisory Details (6)

Auto-updated May 20, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-51/
generic

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-50/
generic

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-48/
generic

Security Vulnerabilities fixed in Firefox ESR 115.36 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-47/
generic

Security Vulnerabilities fixed in Firefox 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-46/
generic

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1860195%2C2029325%2C2029429%2C2029910%2C2035915%2C2038678%2C2038669

Vendor Advisories for CVE-2026-8975(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
redhatfirefox-0:140.11.0-1.el10_02026-06-22redhat
redhatfirefox-0:140.11.0-1.el8_82026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_42026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_62026-06-17redhat
redhatthunderbird-0:140.11.0-1.el9_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_22026-06-17redhat
redhatthunderbird-0:140.11.0-1.el10_02026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_42026-06-17redhat
redhatthunderbird-0:140.11.0-1.el8_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el7_92026-06-17redhat
redhatthunderbird-0:140.11.0-1.el8_82026-06-16redhat
redhatthunderbird-0:140.11.0-1.el9_22026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el9_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_102026-06-03redhat
redhatthunderbird-0:140.11.0-1.el10_22026-06-01redhat
redhatthunderbird-0:140.11.0-1.el9_82026-05-27redhat
redhatfirefox-0:140.11.0-1.el9_82026-05-27redhat
redhatfirefox-0:140.11.0-1.el8_102026-05-27redhat
redhatfirefox-0:140.11.0-1.el10_22026-05-27redhat

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.

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 8× in last 7d / 57× 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 278 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-8975?
CVE-2026-8975 is a high vulnerability published on May 19, 2026. Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox…
When was CVE-2026-8975 disclosed?
CVE-2026-8975 was first published in the National Vulnerability Database on May 19, 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-2026-8975 actively exploited?
CVE-2026-8975 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8975?
CVE-2026-8975 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-8975?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8975, 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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