TI-2026-81224 Aliases CVE-2026-117898 GHSA-w8rr-gr9h-p877

Use-after-free in Mozilla Firefox and Thunderbird JIT component

LOW 28CWE-416Published 2026-10-27 · Updated 2026-11-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

Mozilla Firefox and Thunderbird contain a use-after-free flaw in the JavaScript Engine JIT component (CWE-416). A remote attacker who gets a user to interact with crafted content can cause limited confidentiality, integrity and availability impact. The sources report no known exploitation.

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

Description from the CNA

Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00261 17th percentileScored 2026-11-07

Fix Partial Firefox (Mozilla): 153.6, 159Thunderbird (Mozilla): 153.6, 159Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Firefox	—	153.6, 159	Patch available	CNA
Mozilla	Thunderbird	—	153.6, 159	Patch available	CNA

Firefox VendorMozilla Affected — Fixed in 153.6, 159 Patch available CNA
Thunderbird VendorMozilla Affected — Fixed in 153.6, 159 Patch available CNA

CPE names Threatist (inferred) · 2

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

CPE	Versions	Role	Vendor
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 version 159 or 153.6 and Thunderbird to version 159 or 153.6. The sources list no fixed version for Red Hat Enterprise Linux 7, 8, 9 and 10, and no fix planned for Red Hat Enterprise Linux 6.

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

Fix · CNA Firefox (Mozilla) Fixed in 153.6, 159
Fix · CNA Thunderbird (Mozilla) Fixed in 153.6, 159

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix yet
Red Hat Enterprise Linux 8	Affected	No fix yet
Red Hat Enterprise Linux 9	Affected	No fix yet

Timeline

2026-10-27 Threatist record created from CVE-2026-117898
2026-10-27 Fix available: Mozilla/Thunderbird@159 · CNA
2026-10-27 1 new reference · CNA
2026-10-27 Fix available: Mozilla/[email protected] · CNA
2026-10-27 1 new reference · CNA
2026-10-27 Alias added: GHSA-w8rr-gr9h-p877
2026-10-29 Affected versions changed · Red Hat
2026-10-29 CVSS score added · Red Hat
2026-11-04 CVSS score added · CISA ADP
2026-11-04 Weakness changed · CISA ADP
2026-11-04 CISA SSVC decision points changed

References

Other 5

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