CVE-2026-74977

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 25, 2026

Advisory Details (5)

Auto-updated Aug 18, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 153.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-80/
generic

Security Vulnerabilities fixed in Thunderbird 154 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-78/
generic

Security Vulnerabilities fixed in Firefox ESR 153.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-77/
generic

Security Vulnerabilities fixed in Firefox 154 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-74/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2028440

Vendor Advisories for CVE-2026-74977(1)

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 109× 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 130 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74977?
CVE-2026-74977 is a high vulnerability published on August 18, 2026. Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
When was CVE-2026-74977 disclosed?
CVE-2026-74977 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74977 actively exploited?
CVE-2026-74977 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 71.4% of all scored CVEs.
What is the CVSS score of CVE-2026-74977?
CVE-2026-74977 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-74977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74977, 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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