Vulnerability details

CVE-2026-0884

Use-after-free in the JavaScript Engine component

CVSS 3.1

9.8Critical

Official description

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS scores

Score	Version	Source	Vector
9.8Critical	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
No product information recorded.

References and advisories

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Details

Published: 2026-01-13
Last updated: 2026-04-13
State: Published
Assigner (CNA): mozilla

Exploit prediction (EPSS)

0.46%

Probability of exploitation in 30 days

40.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-416
Use After Free