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TI-2026-05929 Aliases CVE-2026-6764GHSA-c6rq-x839-cgp6

Memory corruption in Mozilla Firefox

Priority LOW 34CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · Low
Fix status
Partial Red Hat: 16 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

Incorrect boundary conditions in the DOM: Device Interfaces component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00231 13th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.10, 150Thunderbird (Mozilla): 140.10, 150Red Hat: 27 advisoriesRed Hat: 16 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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, 150Patch availableCNA
MozillaThunderbird—140.10, 150Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.10, 150 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.10, 150 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 140.10.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 150.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*140.0 to before 140.10.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 140.10.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 150.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions 140.0 to before 140.10.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.10, 150
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.10, 150

Red Hat 27 advisories

  • RHSA-2026:19704 Released 2026-05-20 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.10.0-2.el7_9
  • RHSA-2026:19655 Released 2026-05-20 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.10.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.10.0-1.el8_4
  • RHSA-2026:19542 Released 2026-05-20 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.10.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-140.10.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-140.10.0-1.el8_6
Show 24 more Red Hat advisories
  • RHSA-2026:19462 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.10.0-1.el9_6
  • RHSA-2026:19464 Released 2026-05-20 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-140.10.0-1.el9_4, firefox-x11-140.10.0-1.el9_4
  • RHSA-2026:19466 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.10.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-140.10.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-140.10.0-1.el8_6
  • RHSA-2026:19469 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-140.10.0-1.el9_4
  • RHSA-2026:19467 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.10.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.10.0-1.el8_8
  • RHSA-2026:19468 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-140.10.0-1.el9_0
  • RHSA-2026:19463 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.10.0-1.el10_0
  • RHSA-2026:19465 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.10.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.10.0-1.el8_4
  • RHSA-2026:19461 Released 2026-05-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.10.0-1.el9_2
  • 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-2026:19201 Released 2026-05-19 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.10.0-1.el9_8, firefox-x11-140.10.0-1.el9_8
  • RHSA-2026:19131 Released 2026-05-19 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.10.0-1.el10_2
  • RHSA-2026:19041 Released 2026-05-19 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.10.0-1.el10_2
  • RHSA-2026:17688 Released 2026-05-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.10.0-1.el9_6, firefox-x11-140.10.0-1.el9_6
  • RHSA-2026:17689 Released 2026-05-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.10.0-1.el9_2, firefox-x11-140.10.0-1.el9_2
  • RHSA-2026:17687 Released 2026-05-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-140.10.0-1.el9_0
  • RHSA-2026:17690 Released 2026-05-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.10.0-1.el10_0
  • RHSA-2026:17477 Released 2026-05-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.10.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.10.0-1.el8_8
  • RHSA-2026:15892 Released 2026-05-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.10.0-1.el9_7
  • RHSA-2026:13537 Released 2026-05-04 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.10.0-1.el8_10
  • RHSA-2026:12285 Released 2026-04-30 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.10.0-1.el10_1
  • RHSA-2026:10766 Released 2026-04-27 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.10.0-1.el8_10
  • RHSA-2026:10767 Released 2026-04-27 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.10.0-1.el10_1
  • RHSA-2026:10757 Released 2026-04-27 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.10.0-1.el9_7, firefox-x11-140.10.0-1.el9_7

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-2026:10767, RHSA-2026:12285, RHSA-2026:19041, RHSA-2026:19131
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:10766, RHSA-2026:13537
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:10757, RHSA-2026:15892, RHSA-2026:19201, RHSA-2026:19348
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:19465, RHSA-2026:19655
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:19466, RHSA-2026:19542
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:19466, RHSA-2026:19542
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:17477, RHSA-2026:19467
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:17687, RHSA-2026:19468
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:17689, RHSA-2026:19461
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:17690, RHSA-2026:19463
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:19464, RHSA-2026:19469
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:17688, RHSA-2026:19462
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:19465, RHSA-2026:19655
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:19466, RHSA-2026:19542
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:17477, RHSA-2026:19467
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:19704

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-6764
  2. 2026-10-03 Alias added: GHSA-c6rq-x839-cgp6

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