CVE-2026-74934

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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 (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory

Also known asEUVD-2026-60743 (ENISA EUVD) · GHSA-fwhj-g32m-x3vf (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 18, 2026

Last Modified

August 24, 2026

Advisory Details (8)

Auto-updated Aug 21, 2026
Patch available.
Web page

Security Vulnerabilities fixed in Thunderbird 153.1 — Mozilla

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

Security Vulnerabilities fixed in Thunderbird 140.14 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-79/
Web page

Security Vulnerabilities fixed in Thunderbird 154 — Mozilla

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

Security Vulnerabilities fixed in Firefox ESR 153.1 — Mozilla

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

Security Vulnerabilities fixed in Firefox ESR 140.14 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-76/
Web page

Security Vulnerabilities fixed in Firefox ESR 115.39 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-75/
Web page

Security Vulnerabilities fixed in Firefox 154 — Mozilla

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

Patch Availability(21)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatfirefox-0:140.14.0-1.el9_22026-09-09redhat
redhatthunderbird-0:140.14.0-1.el9_22026-09-09redhat
redhatthunderbird-0:140.14.0-1.el8_82026-09-09redhat
redhatthunderbird-0:140.14.0-1.el8_62026-09-09redhat
redhatthunderbird-0:140.14.0-1.el8_42026-09-09redhat
redhatfirefox-0:140.14.0-1.el8_42026-09-08redhat
redhatfirefox-0:140.14.0-1.el10_02026-09-08redhat
redhatfirefox-0:140.14.0-1.el8_82026-09-08redhat
redhatfirefox-0:140.14.0-1.el8_62026-09-08redhat
redhatthunderbird-0:140.14.0-1.el10_02026-09-08redhat
redhatfirefox-0:140.14.0-1.el7_92026-09-08redhat
redhatthunderbird-0:140.14.0-1.el9_82026-09-08redhat
redhatthunderbird-0:140.14.0-1.el9_62026-09-08redhat
redhatfirefox-0:140.14.0-1.el9_42026-09-08redhat
redhatfirefox-0:140.14.0-1.el9_62026-09-08redhat
redhatthunderbird-0:140.14.0-1.el10_22026-09-08redhat
redhatthunderbird-0:140.14.0-1.el9_42026-09-08redhat
redhatthunderbird-0:140.14.0-1.el8_102026-09-08redhat
redhatfirefox-0:140.14.0-1.el10_22026-08-24redhat
redhatfirefox-0:140.14.0-1.el8_102026-08-24redhat
redhatfirefox-0:140.14.0-1.el9_82026-08-24redhat

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

(6 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (195 versions)
  • every version up to 140.14.0esr-1~deb12u1: fixed in 140.14.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (224 versions)
  • every version up to 1:140.14.0esr-1~deb12u1: fixed in 1:140.14.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (71 versions)
  • every version up to 140.14.0esr-1~deb13u1: fixed in 140.14.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (80 versions)
  • every version up to 1:140.14.0esr-1~deb13u1: fixed in 1:140.14.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (72 versions)
  • every version up to 140.14.0esr-2: fixed in 140.14.0esr-2
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (81 versions)
  • every version up to 1:140.14.0esr-1: fixed in 1:140.14.0esr-1
—

Weakness Classification(3)

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

Additional Vendor Advisories

(2)

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 / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 315 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 215 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:57 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-11-12 14:40 UTCEchelonGraph re-scored
  4. 2026-11-12 14:40 UTCVendor advisory
  5. 2026-11-12 14:40 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  12. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-11-05 03:02 UTCEchelonGraph re-scored
  14. 2026-11-05 03:02 UTCVendor advisory
  15. 2026-11-05 03:02 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-10-28 15:23 UTCEchelonGraph re-scored
  25. 2026-10-28 15:23 UTCVendor advisory
Show 75 more
  1. 2026-10-28 15:23 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  2. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-10-25 14:03 UTCEchelonGraph re-scored
  6. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  7. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  8. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  9. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  10. 2026-10-20 19:07 UTCEchelonGraph re-scored
  11. 2026-10-20 19:07 UTCVendor advisory
  12. 2026-10-20 19:07 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  14. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-10-18 03:13 UTCEchelonGraph re-scored
  16. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-10-13 07:24 UTCEchelonGraph re-scored
  22. 2026-10-13 07:24 UTCVendor advisory
  23. 2026-10-13 07:24 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  25. 2026-10-12 15:39 UTCEchelonGraph re-scored
  26. 2026-10-11 19:25 UTCEchelonGraph re-scored
  27. 2026-10-11 16:41 UTCEchelonGraph re-scored
  28. 2026-10-11 14:00 UTCEchelonGraph re-scored
  29. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  30. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  31. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  32. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  33. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  34. 2026-10-07 11:17 UTCVendor advisory
  35. 2026-10-07 11:17 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-10-06 21:42 UTCEchelonGraph re-scored
  37. 2026-10-06 21:42 UTCVendor advisory
  38. 2026-10-06 21:42 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  39. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  40. 2026-10-06 08:51 UTCEchelonGraph re-scored
  41. 2026-10-06 08:51 UTCVendor advisory
  42. 2026-10-06 08:50 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  43. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  44. 2026-10-05 09:37 UTCEchelonGraph re-scored
  45. 2026-10-05 09:37 UTCVendor advisory
  46. 2026-10-05 09:37 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  48. 2026-10-04 21:45 UTCVendor advisory
  49. 2026-10-04 21:45 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-10-04 05:21 UTCVendor advisory
  51. 2026-10-04 05:21 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-10-03 17:43 UTCEchelonGraph re-scored
  53. 2026-10-03 17:43 UTCVendor advisory
  54. 2026-10-03 17:43 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  56. 2026-10-03 03:21 UTCEchelonGraph re-scored
  57. 2026-10-03 03:21 UTCVendor advisory
  58. 2026-10-03 03:21 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-10-02 15:43 UTCVendor advisory
  60. 2026-10-02 15:42 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-10-02 01:32 UTCEchelonGraph re-scored
  62. 2026-10-02 01:32 UTCVendor advisory
  63. 2026-10-02 01:32 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  65. 2026-10-01 09:17 UTCVendor advisory
  66. 2026-10-01 09:16 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-09-30 21:38 UTCEchelonGraph re-scored
  68. 2026-09-30 21:38 UTCVendor advisory
  69. 2026-09-30 21:38 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-09-30 09:55 UTCEchelonGraph re-scored
  71. 2026-09-30 09:55 UTCVendor advisory
  72. 2026-09-30 09:54 UTCGHSA enrichmentGHSA-fwhj-g32m-x3vf · GitHub severity HIGH · GitHub CVSS 7.5
  73. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  74. 2026-09-28 21:58 UTCEchelonGraph re-scored
  75. 2026-09-28 21:58 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-74934?
CVE-2026-74934 is a high-severity vulnerability; its CVE record was published on August 18, 2026. Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
When was the CVE record for CVE-2026-74934 published?
The CVE record for CVE-2026-74934 was published on August 18, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 24, 2026; the record at its source may have been updated since.
Is CVE-2026-74934 actively exploited?
CVE-2026-74934 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74934?
CVE-2026-74934 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-74934?
A fix for CVE-2026-74934 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74934 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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