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TI-2026-06428 Aliases CVE-2026-7321GHSA-jjvw-q2ff-g9g3

Buffer overflow in Mozilla Firefox

Priority MEDIUM 42CWE-120Published · 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: 15 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-120 and the CVSS impact.

Summary

Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00258 17th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.10.1, 150Thunderbird (Mozilla): 140.10.1, 150Red Hat: 22 advisoriesRed Hat: 15 fixed, 3 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—140.10.1, 150Patch availableCNA
MozillaThunderbird—140.10.1, 150Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.10.1, 150 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.10.1, 150 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 140.10.1VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 150.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*before 140.10.1VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*before 150.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 140.10.1 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 150.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions before 140.10.1 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* Versions before 150.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.10.1, 150
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.10.1, 150

Red Hat 22 advisories

  • RHSA-2026:25014 Released 2026-06-10 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.10.1-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) thunderbird-140.10.1-1.el8_6
  • RHSA-2026:24846 Released 2026-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) thunderbird-140.10.1-1.el9_4
  • RHSA-2026:24844 Released 2026-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.10.1-1.el9_2
Show 19 more Red Hat advisories
  • RHSA-2026:24721 Released 2026-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.10.1-1.el9_6
  • RHSA-2026:24717 Released 2026-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.10.1-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.10.1-1.el8_8
  • RHSA-2026:24719 Released 2026-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.10.1-1.el10_0
  • RHSA-2026:24718 Released 2026-06-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.10.1-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.10.1-1.el8_4
  • RHSA-2026:24345 Released 2026-06-08 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.10.1-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox-140.10.1-1.el8_6
  • RHSA-2026:22847 Released 2026-06-03 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.10.1-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.10.1-1.el8_8
  • RHSA-2026:22712 Released 2026-06-03 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.10.1-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.10.1-1.el8_4
  • RHSA-2026:22708 Released 2026-06-03 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.10.1-1.el7_9
  • RHSA-2026:22409 Released 2026-06-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.10.1-1.el9_6, firefox-x11-140.10.1-1.el9_6
  • RHSA-2026:22408 Released 2026-06-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.10.1-1.el10_0
  • RHSA-2026:22410 Released 2026-06-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.10.1-1.el9_2, firefox-x11-140.10.1-1.el9_2
  • RHSA-2026:22324 Released 2026-06-01 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox-140.10.1-1.el9_4, firefox-x11-140.10.1-1.el9_4
  • RHSA-2026:21743 Released 2026-05-28 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-140.10.1-1.el9_0
  • RHSA-2026:20586 Released 2026-05-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.10.1-1.el8_10
  • RHSA-2026:19588 Released 2026-05-20 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.10.1-1.el8_10
  • RHSA-2026:19348 Released 2026-05-19 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.10.1-1.el9_8
  • RHSA-2026:19370 Released 2026-05-19 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.10.1-1.el9_8, firefox-x11-140.10.1-1.el9_8
  • RHSA-2026:19153 Released 2026-05-19 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.10.1-1.el10_2
  • RHSA-2026:19157 Released 2026-05-19 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.10.1-1.el10_2

Vendor assessments

Red Hat

Red Hat rating: Moderate. 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 Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:19153, RHSA-2026:19157
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:19588, RHSA-2026:20586
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:19348, RHSA-2026:19370
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:22712, RHSA-2026:24718
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:24345, RHSA-2026:25014
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:22847, RHSA-2026:24717
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:21743
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:22410, RHSA-2026:24844
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:22324, RHSA-2026:24846
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:22408, RHSA-2026:24719
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:22409, RHSA-2026:24721
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:22712, RHSA-2026:24718
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:24345, RHSA-2026:25014
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:22847, RHSA-2026:24717
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:22708

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-7321
  2. 2026-10-03 Alias added: GHSA-jjvw-q2ff-g9g3

References

Advisory 4

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