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TI-2026-68415 Aliases CVE-2026-106016GHSA-chh8-pxv3-95vg

Mitigation bypass in Mozilla Firefox and Thunderbird File Handling

Priority MEDIUM 49CWE-693Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-693.

Summary

Mozilla Firefox and Thunderbird contain a mitigation bypass in the File Handling component, classified as a protection mechanism failure (CWE-693) that allows a protective check to be circumvented. A remote attacker without privileges or user interaction can fully compromise confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00319 24th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 157.0.1Thunderbird (Mozilla): 158Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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—157.0.1Patch availableCNA
MozillaThunderbird—158Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 157.0.1 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 158 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 157.0.1VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 157.0.1 Vulnerable ·Mozilla

Remediation

Update Mozilla Firefox to 157.0.1 and Thunderbird to 158. Red Hat reports no fix plan is available for Red Hat Enterprise Linux 7, 8, 9 and 10.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

  • Fix · CNA Firefox (Mozilla) Fixed in 157.0.1
  • Fix · CNA Thunderbird (Mozilla) Fixed in 158

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: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-106016
  2. 2026-10-06 Alias added: GHSA-chh8-pxv3-95vg
  3. 2026-10-07 CVSS score added · CISA ADP
  4. 2026-10-07 Weakness changed · CISA ADP
  5. 2026-10-07 CISA SSVC decision points changed
  6. 2026-10-07 Priority changed: LOW → MEDIUM
  7. 2026-10-13 Fix available: Mozilla/Thunderbird@158 · CNA
  8. 2026-10-13 1 new reference · CNA
  9. 2026-10-30 Affected versions changed · Red Hat
  10. 2026-10-30 CVSS score added · Red Hat

References

Advisory 1

Other 2

  • 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