CVE-2026-2796
Critical9.8Firefox: JIT miscompilation in the JavaScript: WebAssembly componenttitle from the CVE record
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
- CVSS
- 9.8v3.1
- EPSS (exploit probability)
- 0.9%61th pct
- CISA KEV
- Not listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-10-26 | 0.9% | 60.9% |
| 2026-10-25 | 0.9% | 60.9% |
| 2026-10-24 | 0.8% | 54.7% |
| 2026-10-23 | 0.8% | 54.7% |
| 2026-10-22 | 0.8% | 54.7% |
| 2026-10-21 | 0.7% | 51.3% |
| 2026-10-20 | 0.7% | 51.1% |
| 2026-10-19 | 0.7% | 51.0% |
| 2026-10-18 | 0.7% | 51.0% |
| 2026-10-17 | 0.7% | 51.0% |
| 2026-10-16 | 0.7% | 50.9% |
| 2026-10-15 | 0.7% | 50.9% |
| 2026-10-14 | 0.7% | 50.8% |
| 2026-10-13 | 0.7% | 50.6% |
| 2026-10-12 | 0.7% | 49.9% |
| 2026-10-11 | 0.7% | 49.9% |
| 2026-10-10 | 0.7% | 49.9% |
| 2026-10-09 | 0.7% | 49.8% |
| 2026-10-08 | 0.7% | 49.8% |
| 2026-10-07 | 0.7% | 49.8% |
| 2026-10-06 | 0.7% | 49.7% |
| 2026-10-05 | 0.7% | 49.6% |
| 2026-10-04 | 0.7% | 49.6% |
| 2026-10-03 | 0.7% | 49.6% |
| 2026-10-02 | 0.7% | 49.5% |
| 2026-10-01 | 0.7% | 49.5% |
| 2026-09-30 | 0.7% | 49.4% |
| 2026-09-29 | 0.7% | 49.4% |
| 2026-09-27 | 0.7% | 49.3% |
| 2026-09-26 | 0.7% | 49.3% |
| 2026-09-25 | 0.7% | 49.2% |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
- mozilla firefox
- mozilla thunderbird
Coverage1 article
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2013165
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://access.redhat.com/security/cve/CVE-2026-2796
- https://bugzilla.redhat.com/show_bug.cgi?id=2442301
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2796.json