CVE-2026-0878

HIGHPre-NVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-01-13. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
8.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.0Exploit: NoneExposed: 0

A fix is available — apply it.

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS v3
8.0
EG Score
8.0(medium)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity80% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
34.1%
KEV
Not listed

Published

January 13, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Jun 30, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:1413
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:1320
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:0924
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:0694
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:0667
generic

Security Vulnerabilities fixed in Thunderbird 140.7 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-05/
generic

Security Vulnerabilities fixed in Thunderbird 147 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-04/
generic

Security Vulnerabilities fixed in Firefox ESR 140.7 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-03/
generic

Security Vulnerabilities fixed in Firefox 147 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-01/
generic

2003989 - (CVE-2026-0878) out-of-bounds read due to missing size check on shared memory (Sandbox escape)

https://bugzilla.mozilla.org/show_bug.cgi?id=2003989

Vendor Advisories for CVE-2026-0878(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(24)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:140.7.1+build1-0ubuntu0.22.04.1) @ jammy2026-05-21ubuntu
redhatfirefox-0:140.7.0-1.el7_92026-02-09redhat
redhatfirefox-0:140.7.0-1.el10_02026-02-09redhat
redhatthunderbird-0:140.7.0-1.el8_102026-02-09redhat
redhatthunderbird-0:140.7.0-1.el10_02026-02-09redhat
redhatfirefox-0:140.7.0-1.el8_62026-02-05redhat
redhatfirefox-0:140.7.0-1.el9_02026-02-05redhat
redhatfirefox-0:140.7.0-1.el8_42026-02-05redhat
redhatfirefox-0:140.7.0-1.el9_22026-02-05redhat
redhatfirefox-0:140.7.0-1.el8_82026-02-05redhat
redhatfirefox-0:140.7.0-1.el9_42026-02-05redhat
redhatfirefox-0:140.7.0-1.el9_62026-02-05redhat
redhatfirefox-0:140.7.0-1.el8_22026-02-05redhat
redhatthunderbird-0:140.7.0-1.el8_82026-01-28redhat
redhatthunderbird-0:140.7.0-1.el8_22026-01-28redhat
redhatthunderbird-0:140.7.0-1.el8_62026-01-28redhat
redhatthunderbird-0:140.7.0-1.el8_42026-01-28redhat
redhatthunderbird-0:140.7.0-2.el9_62026-01-27redhat
redhatthunderbird-0:140.7.0-1.el9_02026-01-27redhat
redhatthunderbird-0:140.7.0-1.el9_42026-01-27redhat
redhatthunderbird-0:140.7.0-1.el9_22026-01-27redhat
redhatthunderbird-0:140.7.0-1.el9_72026-01-21redhat
redhatfirefox-0:140.7.0-1.el9_72026-01-15redhat
redhatfirefox-0:140.7.0-1.el8_102026-01-15redhat

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

(4)

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 / 33× 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 101 total refreshes for this CVE.

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

What is CVE-2026-0878?
CVE-2026-0878 is a high vulnerability published on January 13, 2026. Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
When was CVE-2026-0878 disclosed?
CVE-2026-0878 was first published in the National Vulnerability Database on January 13, 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-2026-0878 actively exploited?
CVE-2026-0878 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-0878?
CVE-2026-0878 has a CVSS v3.1 base score of 8.0 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-0878?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0878, 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

Explore the affected products and dependency analysis for CVE-2026-0878

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