CVE-2026-4710

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
33rd
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

March 24, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Oct 13, 2026
Patch available.
Web page

Security Vulnerabilities fixed in Thunderbird 140.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-24/
Web page

Security Vulnerabilities fixed in Thunderbird 149 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-23/
Web page

Security Vulnerabilities fixed in Firefox ESR 140.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-22/
Web page

Security Vulnerabilities fixed in Firefox 149 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-20/
Web page

2016370 - (CVE-2026-4710) RemoteImageHolder Display Rect Mismatch OOB Read

https://bugzilla.mozilla.org/show_bug.cgi?id=2016370

Patch Availability(25)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatthunderbird-0:140.9.0-1.el8_42026-04-20redhat
redhatfirefox-0:140.9.0-1.el7_92026-04-16redhat
redhatthunderbird-0:140.9.0-1.el9_02026-04-15redhat
redhatthunderbird-0:140.9.0-1.el10_02026-04-15redhat
redhatthunderbird-0:140.9.0-1.el9_42026-04-15redhat
redhatthunderbird-0:140.9.0-1.el8_62026-04-15redhat
redhatthunderbird-0:140.9.0-1.el9_62026-04-15redhat
redhatthunderbird-0:140.9.0-1.el9_22026-04-15redhat
redhatthunderbird-0:140.9.0-1.el8_22026-04-15redhat
redhatthunderbird-0:140.9.0-1.el8_82026-04-15redhat
redhatfirefox-0:140.9.0-1.el8_82026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_02026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_42026-04-13redhat
redhatfirefox-0:140.9.0-1.el10_02026-04-13redhat
redhatfirefox-0:140.9.0-1.el8_22026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_62026-04-13redhat
redhatfirefox-0:140.9.0-1.el8_42026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_22026-04-13redhat
redhatfirefox-0:140.9.0-1.el8_62026-04-13redhat
redhatthunderbird-0:140.9.0-1.el8_102026-04-07redhat
redhatthunderbird-0:140.9.0-1.el10_12026-04-01redhat
redhatthunderbird-0:140.9.0-1.el9_72026-03-30redhat
redhatfirefox-0:140.9.0-1.el8_102026-03-26redhat
redhatfirefox-0:140.9.0-1.el10_12026-03-26redhat
redhatfirefox-0:140.9.0-1.el9_72026-03-26redhat

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 rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (255 versions)
  • every version up to 140.9.0esr-1~deb11u1: fixed in 140.9.0esr-1~deb11u1
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (306 versions)
  • every version up to 1:140.9.0esr-1~deb11u1: fixed in 1:140.9.0esr-1~deb11u1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.8.0esr-1~deb13u1 (161 versions)
  • every version up to 140.9.0esr-1~deb12u1: fixed in 140.9.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.9.0esr-1~deb11u1 (191 versions)
  • every version up to 1:140.9.0esr-1~deb12u1: fixed in 1:140.9.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.8.0esr-1~deb13u1 (36 versions)
  • every version up to 140.9.0esr-1~deb13u1: fixed in 140.9.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.0esr-1~deb11u1 (46 versions)
  • every version up to 1:140.9.0esr-1~deb13u1: fixed in 1:140.9.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.0esr-1~deb13u1 (39 versions)
  • every version up to 140.9.0esr-1: fixed in 140.9.0esr-1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.0esr-1~deb13u1 (48 versions)
  • every version up to 1:140.9.0esr-1: fixed in 1:140.9.0esr-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

Data Freshness Timeline

(refreshed 26× in last 7d / 53× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 100 of 299 refreshes 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 199 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 23:22 UTCEG score recompute
  2. 2026-10-19 23:22 UTCVendor advisory
  3. 2026-10-19 23:21 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  5. 2026-10-18 22:06 UTCEG score recompute
  6. 2026-10-18 22:06 UTCVendor advisory
  7. 2026-10-18 22:06 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-10-18 03:36 UTCEG score recompute
  10. 2026-10-17 20:20 UTCEG score recompute
  11. 2026-10-17 20:20 UTCVendor advisory
  12. 2026-10-17 20:20 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-10-16 19:03 UTCEG score recompute
  15. 2026-10-16 19:03 UTCVendor advisory
  16. 2026-10-16 19:03 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-10-15 16:16 UTCEG score recompute
  20. 2026-10-15 16:16 UTCVendor advisory
  21. 2026-10-15 16:16 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  23. 2026-10-14 10:21 UTCEG score recompute
  24. 2026-10-14 10:21 UTCVendor advisory
  25. 2026-10-14 10:20 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-10-13 08:51 UTCEG score recompute
  3. 2026-10-13 08:51 UTCVendor advisory
  4. 2026-10-13 08:50 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  6. 2026-10-12 16:02 UTCEG score recompute
  7. 2026-10-12 07:34 UTCVendor advisory
  8. 2026-10-12 07:33 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-11 19:45 UTCEG score recompute
  10. 2026-10-11 16:59 UTCEG score recompute
  11. 2026-10-11 14:24 UTCEG score recompute
  12. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  15. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  25. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  26. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  27. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  28. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  29. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  30. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  31. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  32. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  34. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  35. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  36. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  38. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  39. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  40. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  41. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  42. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  43. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  44. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  45. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  46. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  47. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  48. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  49. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  50. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  51. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  52. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  53. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  54. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  55. 2026-08-16 10:39 UTCEG score recompute
  56. 2026-08-16 10:39 UTCVendor advisory
  57. 2026-08-16 10:39 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  59. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  60. 2026-08-14 23:45 UTCVendor advisory
  61. 2026-08-14 23:45 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-08-14 19:41 UTCVendor advisory
  63. 2026-08-14 19:41 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-08-14 15:02 UTCVendor advisory
  65. 2026-08-14 15:02 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-08-14 10:55 UTCVendor advisory
  67. 2026-08-14 10:55 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-08-14 06:52 UTCEG score recompute
  69. 2026-08-14 06:52 UTCVendor advisory
  70. 2026-08-14 06:52 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  72. 2026-08-13 01:35 UTCVendor advisory
  73. 2026-08-13 01:35 UTCGHSA enrichmentGHSA-6q85-p5cm-28vf · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-08-12 21:32 UTCEG score recompute
  75. 2026-08-12 21:32 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-4710?
CVE-2026-4710 is a critical-severity vulnerability; its CVE record was published on March 24, 2026. Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
When was the CVE record for CVE-2026-4710 published?
The CVE record for CVE-2026-4710 was published on March 24, 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 June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-4710 actively exploited?
CVE-2026-4710 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4710?
CVE-2026-4710 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4710?
A fix for CVE-2026-4710 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-4710 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-4710

Explore →

Is Your Infrastructure Affected by CVE-2026-4710?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.