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TI-2026-02077 Aliases CVE-2026-2447GHSA-c99q-x737-hc5j

Heap-based buffer overflow in Mozilla Firefox

Priority MEDIUM 41CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 25 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00699 53rd percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 115.32.1, 140.7.1, 147.0.4Thunderbird (Mozilla): 140.7.2, 147.0.2Red Hat: 42 advisoriesRed Hat: 25 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox—115.32.1, 140.7.1, 147.0.4Patch availableCNA
MozillaThunderbird—140.7.2, 147.0.2Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 115.32.1, 140.7.1, 147.0.4 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.7.2, 147.0.2 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 115.32.1VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 147.0.4VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*116.0 to before 140.7.1VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 140.7.2; 141.0 to before 147.0.2VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 115.32.1 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 147.0.4 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions 116.0 to before 140.7.1 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 140.7.2; 141.0 to before 147.0.2 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 115.32.1, 140.7.1, 147.0.4
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.7.2, 147.0.2

Red Hat 42 advisories

  • RHSA-2026:16174 Released 2026-05-12 · Red Hat rating Important
    Red Hat AI Inference Server 3.3.3 (Spyre)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-spyre-rhel9
  • RHSA-2026:8748 Released 2026-04-17 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.3.1 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
  • RHSA-2026:8746 Released 2026-04-17 · Red Hat rating Important
    Red Hat AI Inference Server 3.3.1 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-cuda-rhel9
Show 39 more Red Hat advisories
  • RHSA-2026:8747 Released 2026-04-17 · Red Hat rating Important
    Red Hat AI Inference Server 3.3.1 (ROCm)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-rocm-rhel9
  • RHSA-2026:5326 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) libvpx-1.9.0-7.el9_0.3
  • RHSA-2026:5324 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) libvpx-devel-1.9.0-7.el9_4.3
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) libvpx-1.9.0-7.el9_4.3
  • RHSA-2026:5320 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) libvpx-1.3.0-8.el7_9.3, libvpx-1.3.0-8.el7_9.3.ppc
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) libvpx-devel-1.3.0-8.el7_9.3, libvpx-devel-1.3.0-8.el7_9.3.ppc, libvpx-utils-1.3.0-8.el7_9.3
  • RHSA-2026:5323 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) libvpx-1.7.0-10.el8_4.2
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libvpx-1.7.0-10.el8_4.2
  • RHSA-2026:5319 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) libvpx-1.9.0-7.el9_2.3
  • RHSA-2026:5231 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) libvpx-devel-1.9.0-9.el9_6.1
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) libvpx-1.9.0-9.el9_6.1
  • RHSA-2026:5229 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) libvpx-1.7.0-10.el8_6.2
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) libvpx-1.7.0-10.el8_6.2
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) libvpx-1.7.0-10.el8_6.2
  • RHSA-2026:5230 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) libvpx-1.7.0-10.el8_8.2
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) libvpx-1.7.0-10.el8_8.2
  • RHSA-2026:5227 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libvpx-1.14.1-3.el10_0.1
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libvpx-devel-1.14.1-3.el10_0.1
  • RHSA-2026:5228 Released 2026-03-23 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) libvpx-1.7.0-8.el8_2.2
  • RHSA-2026:4629 Released 2026-03-16 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream (v. 10) libvpx-1.14.1-6.el10_1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libvpx-devel-1.14.1-6.el10_1
  • RHSA-2026:4447 Released 2026-03-12 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream (v. 9) libvpx-1.9.0-10.el9_7
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libvpx-devel-1.9.0-10.el9_7
  • RHSA-2026:4432 Released 2026-03-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-140.8.0-1.el8_2
  • RHSA-2026:4260 Released 2026-03-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.8.0-2.el10_0
  • RHSA-2026:4152 Released 2026-03-10 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.8.0-2.el9_2, firefox-x11-140.8.0-2.el9_2
  • RHSA-2026:3976 Released 2026-03-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.8.0-2.el10_0
  • RHSA-2026:4022 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.8.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.8.0-1.el8_8
  • RHSA-2026:3982 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.8.0-1.el9_6
  • RHSA-2026:3981 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-140.8.0-1.el9_4
  • RHSA-2026:3984 Released 2026-03-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.8.0-2.el7_9
  • RHSA-2026:3980 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.8.0-2.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.8.0-2.el8_4
  • RHSA-2026:3979 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.8.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-140.8.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-140.8.0-1.el8_6
  • RHSA-2026:3978 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.8.0-1.el9_2
  • RHSA-2026:3983 Released 2026-03-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-140.8.0-1.el9_0
  • RHSA-2026:3967 Released 2026-03-09 · Red Hat rating Important
    libvpx security update
    • Red Hat Enterprise Linux AppStream (v. 8) libvpx-1.7.0-13.el8_10
    • Red Hat Enterprise Linux CRB (v. 8) libvpx-devel-1.7.0-13.el8_10
  • RHSA-2026:3516 Released 2026-03-02 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.8.0-1.el9_7
  • RHSA-2026:3517 Released 2026-03-02 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.8.0-2.el10_1
  • RHSA-2026:3515 Released 2026-03-02 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.8.0-1.el8_10
  • RHSA-2026:3496 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-140.8.0-2.el9_4, firefox-x11-140.8.0-2.el9_4
  • RHSA-2026:3497 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.8.0-2.el9_6, firefox-x11-140.8.0-2.el9_6
  • RHSA-2026:3495 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.8.0-2.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-140.8.0-2.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-140.8.0-2.el8_6
  • RHSA-2026:3494 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.8.0-2.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.8.0-2.el8_8
  • RHSA-2026:3493 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-140.8.0-2.el9_0
  • RHSA-2026:3492 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-140.8.0-2.el8_2
  • RHSA-2026:3491 Released 2026-03-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.8.0-2.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.8.0-2.el8_4
  • RHSA-2026:3361 Released 2026-02-25 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.8.0-2.el10_1
  • RHSA-2026:3339 Released 2026-02-25 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.8.0-2.el9_7, firefox-x11-140.8.0-2.el9_7
  • RHSA-2026:3338 Released 2026-02-25 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.8.0-2.el8_10

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat AI Inference Server 3.3Fixed RHSA-2026:16174, RHSA-2026:8746, RHSA-2026:8747, RHSA-2026:8748
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:5324
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:5231
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:3361, RHSA-2026:3517, RHSA-2026:4629
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:3338, RHSA-2026:3515, RHSA-2026:3967
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:3339, RHSA-2026:3516, RHSA-2026:4447
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2026:3492, RHSA-2026:4432, RHSA-2026:5228
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:3491, RHSA-2026:3980, RHSA-2026:5323
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:3495, RHSA-2026:3979, RHSA-2026:5229
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:3495, RHSA-2026:3979, RHSA-2026:5229
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:3494, RHSA-2026:4022, RHSA-2026:5230
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:3493, RHSA-2026:3983, RHSA-2026:5326
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:3978, RHSA-2026:4152, RHSA-2026:5319
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:3976, RHSA-2026:4260, RHSA-2026:5227
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:3496, RHSA-2026:3981, RHSA-2026:5324
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:3497, RHSA-2026:3982, RHSA-2026:5231
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:3491, RHSA-2026:3980, RHSA-2026:5323
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:3495, RHSA-2026:3979, RHSA-2026:5229
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:3494, RHSA-2026:4022, RHSA-2026:5230
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:3967
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:4629
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:4447
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:5227
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:3984, RHSA-2026:5320
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:5320

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-2447
  2. 2026-10-03 Alias added: GHSA-c99q-x737-hc5j
  3. 2026-10-14 EPSS moved to the 50th–90th percentile

References

Advisory 2

Other 1

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences