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TI-2026-71684 Aliases CVE-2026-109774GHSA-qh34-w7pf-vgw9

Invalid pointer, undefined behavior in the DOM: Notifications component

Priority MEDIUM 49CWE-824Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-824 and the CVSS impact.

Summary

Mozilla Firefox and Thunderbird contain a flaw in the DOM Notifications component where an invalid pointer is used, causing undefined behavior (CWE-824, access of uninitialized pointer). The sources do not describe the attacker requirements or the exact impact beyond the CVSS vector, which rates the flaw as network-exploitable with no privileges or user interaction and high confidentiality, integrity and availability impact. The sources do not report public exploitation or CISA KEV listing.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

Invalid pointer, undefined behavior in the DOM: Notifications component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00342 27th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 158Thunderbird (Mozilla): 158

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—158Patch availableCNA
MozillaThunderbird—158Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 158 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 158 Patch available CNA

CPE names Threatist (inferred) · 2

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*——Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*——Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions — — ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions — — ·Mozilla

Remediation

Mozilla Firefox and Thunderbird fixed this flaw in version 158, so update Firefox and Thunderbird to version 158 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

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

Vendor assessments

Red Hat

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

Not affected: 5 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-109774
  2. 2026-10-13 Alias added: GHSA-qh34-w7pf-vgw9
  3. 2026-10-13 Fix available: Mozilla/Thunderbird@158 · CNA
  4. 2026-10-13 1 new reference · CNA
  5. 2026-10-26 CVSS score added · CISA ADP
  6. 2026-10-26 Weakness changed · CISA ADP
  7. 2026-10-26 CISA SSVC decision points changed
  8. 2026-10-26 Priority changed: LOW → MEDIUM
  9. 2026-10-31 Affected versions changed · Red Hat
  10. 2026-10-31 CVSS score added · Red Hat

References

Other 3

  • 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 4204 →

Sources

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