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TI-2026-84258 Aliases CVE-2026-120572GHSA-5rc2-pf3x-xh5v

Incorrect boundary conditions in Mozilla Firefox Layout component

Priority MEDIUM 40CWE-119Published · 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
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

Incorrect boundary conditions in the Layout: Block and Inline component of Mozilla Firefox allow memory corruption through improper restriction of operations within the bounds of a memory buffer (CWE-119). The source description does not state what an attacker must do, but the CVSS vector indicates a network attacker needs no privileges and user interaction, with high impact to confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

Incorrect boundary conditions in the Layout: Block and Inline component. This vulnerability was fixed in Firefox 159.0.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00329 26th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 159.0.1

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—159.0.1Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 159.0.1 Patch available CNA

CPE names Threatist (inferred) · 1

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:firefox:*:*:*:*:*:*:*:* Versions — — ·Mozilla

Remediation

Update Mozilla Firefox to version 159.0.1, which fixes this vulnerability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA Firefox (Mozilla) Fixed in 159.0.1

Vendor assessments

Red Hat

Red Hat rating: Important. 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. 2026-11-03 Threatist record created from CVE-2026-120572
  2. 2026-11-03 CVSS score added · CISA ADP
  3. 2026-11-03 Weakness changed · CISA ADP
  4. 2026-11-03 CISA SSVC decision points changed
  5. 2026-11-03 Alias added: GHSA-5rc2-pf3x-xh5v
  6. 2026-11-04 Affected versions changed · Red Hat
  7. 2026-11-04 CVSS score added · Red Hat
  8. 2026-11-05 Priority changed: LOW → MEDIUM

References

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 4204 →

Sources

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