CVE-2026-2447

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-02-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
8.8EG
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: 0.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.6% × 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
0.7%
EPSS %ILE
52nd
KEV
Not listed

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.

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

February 16, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jun 7, 2026
Patch available.
Web pageMentions a patch (unverified)

[SECURITY] [DLA 4489-1] libvpx security update

https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html
Web page

Security Vulnerabilities fixed in Thunderbird 147.0.2 and 140.7.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-11/
Web page

Security Vulnerabilities fixed in Firefox 147.0.4, ESR 140.7.1, and ESR 115.32.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-10/
Web page

2014390 - (CVE-2026-2447) Heap buffer overflow in libvpx

https://bugzilla.mozilla.org/show_bug.cgi?id=2014390

Vendor Advisories for CVE-2026-2447(20)

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

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhaiis/vllm-spyre-rhel9:17782445462026-05-12redhat
redhatrhaiis/model-opt-cuda-rhel9:17757498572026-04-17redhat
redhatrhaiis/vllm-cuda-rhel9:17756801922026-04-17redhat
redhatrhaiis/vllm-rocm-rhel9:17756802622026-04-17redhat
redhatlibvpx-0:1.9.0-7.el9_4.32026-03-23redhat
redhatlibvpx-0:1.9.0-7.el9_2.32026-03-23redhat
redhatlibvpx-0:1.3.0-8.el7_9.32026-03-23redhat
redhatlibvpx-0:1.9.0-7.el9_0.32026-03-23redhat
redhatlibvpx-0:1.9.0-9.el9_6.12026-03-23redhat
redhatlibvpx-0:1.14.1-3.el10_0.12026-03-23redhat
redhatlibvpx-0:1.7.0-10.el8_4.22026-03-23redhat
redhatlibvpx-0:1.7.0-10.el8_8.22026-03-23redhat
redhatlibvpx-0:1.7.0-8.el8_2.22026-03-23redhat
redhatlibvpx-0:1.7.0-10.el8_6.22026-03-23redhat
redhatlibvpx-0:1.14.1-6.el10_12026-03-16redhat
redhatlibvpx-0:1.9.0-10.el9_72026-03-12redhat
redhatthunderbird-0:140.8.0-1.el8_22026-03-12redhat
redhatthunderbird-0:140.8.0-2.el10_02026-03-11redhat
redhatfirefox-0:140.8.0-2.el9_22026-03-10redhat
redhatthunderbird-0:140.8.0-1.el8_62026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_22026-03-09redhat
redhatfirefox-0:140.8.0-2.el10_02026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_62026-03-09redhat
redhatlibvpx-0:1.7.0-13.el8_102026-03-09redhat
redhatthunderbird-0:140.8.0-2.el8_42026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_42026-03-09redhat
redhatfirefox-0:140.8.0-2.el7_92026-03-09redhat
redhatthunderbird-0:140.8.0-1.el9_02026-03-09redhat
redhatthunderbird-0:140.8.0-1.el8_82026-03-09redhat
redhatfirefox-0:140.8.0-2.el8_22026-03-02redhat

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

(12 across 4 ecosystems)
Debian:11(3)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (254 versions)
  • every version up to 140.8.0esr-1: fixed in 140.8.0esr-1
—
libvpx1.9.0-1, 1.9.0-1+deb11u1, 1.9.0-1+deb11u2, 1.9.0-1+deb11u3, 1.9.0-1+deb11u4
  • every version up to 1.9.0-1+deb11u5: fixed in 1.9.0-1+deb11u5
—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (305 versions)
  • every version up to 1:140.8.0esr-1: fixed in 1:140.8.0esr-1
—
Debian:12(3)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.8.0esr-1~deb13u1 (160 versions)
  • every version up to 140.8.0esr-1: fixed in 140.8.0esr-1
—
libvpx1.12.0-1, 1.12.0-1+deb12u1, 1.12.0-1+deb12u2, 1.12.0-1+deb12u3, 1.12.0-1+deb12u4
  • every version up to 1.12.0-1+deb12u5: fixed in 1.12.0-1+deb12u5
—
thunderbird1:102.11.0-1 ... 1:140.8.0esr-1~deb13u1 (189 versions)
  • every version up to 1:140.8.0esr-1: fixed in 1:140.8.0esr-1
—
Debian:13(3)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.8.0esr-1~deb13u1 (35 versions)
  • every version up to 140.8.0esr-1: fixed in 140.8.0esr-1
—
libvpx1.15.0-2.1
  • every version up to 1.15.0-2.1+deb13u1: fixed in 1.15.0-2.1+deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.8.0esr-1~deb13u1 (44 versions)
  • every version up to 1:140.8.0esr-1: fixed in 1:140.8.0esr-1
—
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.8.0esr-1~deb13u1 (35 versions)
  • every version up to 140.8.0esr-1: fixed in 140.8.0esr-1
—
libvpx1.15.0-2.1, 1.15.2-1, 1.15.2-2, 1.16.0-1, 1.16.0-2
  • every version up to 1.16.0-3: fixed in 1.16.0-3
—
thunderbird1:128.13.0esr-1 ... 1:140.8.0esr-1~deb13u1 (44 versions)
  • every version up to 1:140.8.0esr-1: fixed in 1:140.8.0esr-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(16)

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 12× in last 7d / 29× 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 95 of 230 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 135 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-10-12 16:20 UTCEG score recompute
  6. 2026-10-11 20:02 UTCEG score recompute
  7. 2026-10-11 17:15 UTCEG score recompute
  8. 2026-10-11 14:47 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-10-09 08:25 UTCOSV refresh
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  23. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  25. 2026-09-19 15:03 UTCOSV refresh
Show 70 more
  1. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  6. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  7. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-08-31 18:34 UTCOSV refresh
  17. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  19. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  21. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  22. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  24. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  26. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  27. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  28. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  29. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  30. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  31. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  32. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  33. 2026-08-14 22:29 UTCVendor advisory
  34. 2026-08-14 22:29 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  35. 2026-08-14 09:57 UTCEG score recompute
  36. 2026-08-14 09:57 UTCVendor advisory
  37. 2026-08-14 09:57 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  39. 2026-08-13 02:17 UTCEG score recompute
  40. 2026-08-13 02:17 UTCVendor advisory
  41. 2026-08-13 02:17 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  42. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  43. 2026-08-11 07:49 UTCEG score recompute
  44. 2026-08-11 07:49 UTCVendor advisory
  45. 2026-08-11 07:49 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  46. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  47. 2026-08-10 02:32 UTCVendor advisory
  48. 2026-08-10 02:32 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-08-09 14:25 UTCEG score recompute
  50. 2026-08-09 14:25 UTCVendor advisory
  51. 2026-08-09 14:25 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  52. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  53. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  54. 2026-08-08 09:57 UTCVendor advisory
  55. 2026-08-08 09:57 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  56. 2026-08-07 21:51 UTCEG score recompute
  57. 2026-08-07 21:51 UTCVendor advisory
  58. 2026-08-07 21:51 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  59. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  60. 2026-08-06 03:42 UTCEG score recompute
  61. 2026-08-06 03:42 UTCVendor advisory
  62. 2026-08-06 03:42 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  63. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  64. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  65. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  66. 2026-08-02 20:29 UTCEG score recompute
  67. 2026-08-02 20:29 UTCVendor advisory
  68. 2026-08-02 20:29 UTCGHSA enrichmentGHSA-c99q-x737-hc5j · GitHub severity HIGH · GitHub CVSS 8.8
  69. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  70. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile

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Frequently asked(5)

What is CVE-2026-2447?
CVE-2026-2447 is a high-severity vulnerability; its CVE record was published on February 16, 2026. Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
When was the CVE record for CVE-2026-2447 published?
The CVE record for CVE-2026-2447 was published on February 16, 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 July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-2447 actively exploited?
CVE-2026-2447 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-2447?
CVE-2026-2447 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-2447?
A fix for CVE-2026-2447 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-2447 are linked in the Vendor Advisories panel on this page.

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