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TI-2026-62155 Aliases CVE-2026-92026GHSA-4gpp-v4j5-5hhg

Use after free in Mozilla Firefox

Priority MEDIUM 40CWE-416Published · 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: 14 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

Use-after-free in the Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.16, 153.3, 156Thunderbird (Mozilla): 140.16, 153.3, 156Red Hat: 21 advisoriesRed Hat: 14 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—140.16, 153.3, 156Patch availableCNA
MozillaThunderbird—140.16, 153.3, 156Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.16, 153.3, 156 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.16, 153.3, 156 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 140.16.0; 141.0 to before 153.3.0; 154.0.0 to before 156.0.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 140.16.0; 141.0 to before 153.3.0; 154.0 to before 156.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 140.16.0; 141.0 to before 153.3.0; 154.0.0 to before 156.0.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 140.16.0; 141.0 to before 153.3.0; 154.0 to before 156.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.16, 153.3, 156
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.16, 153.3, 156

Red Hat 21 advisories

  • RHSA-2026:83496 Released 2026-10-15 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.16.0-1.el7_9
  • RHSA-2026:83077 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox-140.16.0-1.el9_4, firefox-x11-140.16.0-1.el9_4
  • RHSA-2026:83076 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.16.0-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox-140.16.0-1.el8_6
Show 18 more Red Hat advisories
  • RHSA-2026:82817 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.16.0-1.el9_6, firefox-x11-140.16.0-1.el9_6
  • RHSA-2026:82818 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.16.0-1.el10_0
  • RHSA-2026:82780 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.16.0-1.el9_2, firefox-x11-140.16.0-1.el9_2
  • RHSA-2026:82779 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.16.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.16.0-1.el8_4
  • RHSA-2026:82720 Released 2026-10-14 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.16.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.16.0-1.el8_8
  • RHSA-2026:82122 Released 2026-10-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.16.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.16.0-1.el8_4
  • RHSA-2026:81912 Released 2026-10-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.16.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.16.0-1.el8_8
  • RHSA-2026:81884 Released 2026-10-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.16.0-1.el9_6
  • RHSA-2026:81913 Released 2026-10-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.16.0-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) thunderbird-140.16.0-1.el8_6
  • RHSA-2026:81393 Released 2026-10-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) thunderbird-140.16.0-1.el9_4
  • RHSA-2026:81392 Released 2026-10-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.16.0-1.el10_0
  • RHSA-2026:81394 Released 2026-10-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.16.0-1.el9_2
  • RHSA-2026:73971 Released 2026-09-30 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.16.0-1.el8_10
  • RHSA-2026:73130 Released 2026-09-29 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.16.0-1.el10_2
  • RHSA-2026:71652 Released 2026-09-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.16.0-1.el8_10
  • RHSA-2026:70642 Released 2026-09-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.16.0-1.el9_8
  • RHSA-2026:69462 Released 2026-09-21 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.16.0-1.el9_8, firefox-x11-140.16.0-1.el9_8
  • RHSA-2026:69461 Released 2026-09-21 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.16.0-1.el10_2

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 Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:69461, RHSA-2026:73130
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:71652, RHSA-2026:73971
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:69462, RHSA-2026:70642
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:82122, RHSA-2026:82779
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:81913, RHSA-2026:83076
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:81912, RHSA-2026:82720
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:81394, RHSA-2026:82780
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:81393, RHSA-2026:83077
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:81392, RHSA-2026:82818
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:81884, RHSA-2026:82817
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:82122, RHSA-2026:82779
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:81913, RHSA-2026:83076
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:81912, RHSA-2026:82720
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:83496

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-92026
  2. 2026-10-03 Alias added: GHSA-4gpp-v4j5-5hhg
  3. 2026-10-12 Fix available: RHSA-2026:81392 · Red Hat
  4. 2026-10-12 Fix available: RHSA-2026:81394 · Red Hat
  5. 2026-10-13 Fix available: RHSA-2026:81393 · Red Hat
  6. 2026-10-13 Fix available: RHSA-2026:81912 · Red Hat
  7. 2026-10-13 Fix available: RHSA-2026:81913 · Red Hat
  8. 2026-10-13 Fix available: RHSA-2026:81884 · Red Hat
  9. 2026-10-13 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.8) +7 · Red Hat
  10. 2026-10-14 Fix available: RHSA-2026:82122 · Red Hat
  11. 2026-10-14 Fix available: RHSA-2026:82720 · Red Hat
  12. 2026-10-14 Fix available: RHSA-2026:82780 · Red Hat
  13. 2026-10-14 Fix available: RHSA-2026:82779 · Red Hat
  14. 2026-10-15 Fix available: RHSA-2026:82818 · Red Hat
  15. 2026-10-15 Fix available: RHSA-2026:82817 · Red Hat
  16. 2026-10-16 Fix available: RHSA-2026:83076 · Red Hat
  17. 2026-10-16 Fix available: RHSA-2026:83077 · Red Hat
  18. 2026-10-16 Fix available: RHSA-2026:83496 · Red Hat
  19. 2026-10-16 Fix available: Red Hat Enterprise Linux Server (v. 7 ELS) · Red Hat

References

Advisory 6

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