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TI-2026-76875 Aliases CVE-2026-113399GHSA-47gv-v7w4-92mq

Incorrect boundary conditions in Firefox and Thunderbird SVG component

Priority MEDIUM 49CWE-190Published · 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-190 and the CVSS impact.

Summary

Mozilla Firefox before 158.0.1 and Thunderbird before 158.0.1 contain incorrect boundary conditions in the SVG component. The flaw is an integer overflow or wraparound (CWE-190). A remote attacker without privileges or user interaction can exploit it to gain high confidentiality, integrity and availability impact.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00489 42nd percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 158.0.1Thunderbird (Mozilla): 158.0.1

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—158.0.1Patch availableCNA
MozillaThunderbird—158.0.1Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 158.0.1 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 158.0.1 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

Update Firefox to 158.0.1 and Thunderbird to 158.0.1, which fix this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA Firefox (Mozilla) Fixed in 158.0.1
  • Fix · CNA Thunderbird (Mozilla) Fixed in 158.0.1

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-113399
  2. 2026-10-20 Alias added: GHSA-47gv-v7w4-92mq
  3. 2026-10-20 Fix available: Mozilla/[email protected] · CNA
  4. 2026-10-20 1 new reference · CNA
  5. 2026-10-29 CVSS score added · CISA ADP
  6. 2026-10-29 Weakness changed · CISA ADP
  7. 2026-10-29 CISA SSVC decision points changed
  8. 2026-10-29 Priority changed: LOW → MEDIUM

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