CVE-2026-2804: Use-after-free in the JavaScript: WebAssembly component
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 148 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 148 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 148
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-2757
- CVE-2026-2758
- CVE-2026-2759
- CVE-2026-2795
- CVE-2026-2760
- CVE-2026-2761
- CVE-2026-2762
- CVE-2026-2763
- CVE-2026-2764
- CVE-2026-2796
- CVE-2026-2797
- CVE-2026-2765
- CVE-2026-2766
- CVE-2026-2767
- CVE-2026-2768
- CVE-2026-2798
- CVE-2026-2769
- CVE-2026-2799
- CVE-2026-2770
- CVE-2026-2771
- CVE-2026-2772
- CVE-2026-2773
- CVE-2026-2774
- CVE-2026-2775
- CVE-2026-2776
- CVE-2026-2777
- CVE-2026-2778
- CVE-2026-2779
- CVE-2026-2800
- CVE-2026-2780
- CVE-2026-2781
- CVE-2026-2801
- CVE-2026-2782
- CVE-2026-2783
- CVE-2026-2802
- CVE-2026-2803
- CVE-2026-2784
- CVE-2026-2785
- CVE-2026-2804
- CVE-2026-2786
- CVE-2026-2805
- CVE-2026-2787
- CVE-2026-2788
- CVE-2026-2789
- CVE-2026-2806
- CVE-2026-2790
- CVE-2026-2791
- CVE-2026-2807
- CVE-2026-2792
- CVE-2026-2793
- CVE-2026-2794
Frequently Asked Questions
What is the severity of CVE-2026-2804?
The severity of CVE-2026-2804 is medium with a CVSS score of 5.4.
What type of vulnerability is CVE-2026-2804?
CVE-2026-2804 is classified as a Use-after-free vulnerability in the JavaScript: WebAssembly component.
How do I fix CVE-2026-2804?
To fix CVE-2026-2804, update to Firefox 148 or Thunderbird 148 or later versions.
What is the impact of CVE-2026-2804?
CVE-2026-2804 may allow unauthorized access to memory, potentially leading to information leakage.
Which software is affected by CVE-2026-2804?
CVE-2026-2804 affects Mozilla Firefox and Mozilla Thunderbird.