VDB
CVE-2026-92021
CVE-2026-92021
PUBLISHED
CVSS 8.8 HIGH
Use-after-free in the JavaScript Engine: JIT component
Reported by mozilla · Published September 15, 2026
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 140.16 and Thunderbird 140.16.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| firefox | errata.rockylinux.org | 140.16.0-1.el9, 140.16.0-1.el8, 140.16.0-1.el10 |
| thunderbird-debuginfo | errata.rockylinux.org | 140.16.0-1.el9, 140.16.0-1.el8, 140.16.0-1.el10 |
| thunderbird-debugsource | errata.rockylinux.org | 140.16.0-1.el9, 140.16.0-1.el8, 140.16.0-1.el10 |
| thunderbird | errata.rockylinux.org | 140.16.0-1.el9, 140.16.0-1.el8, 140.16.0-1.el10 |
| firefox-debugsource | errata.rockylinux.org | 140.16.0-1.el9, 140.16.0-1.el8, 140.16.0-1.el10 |
| firefox-x11 | errata.rockylinux.org | 140.16.0-1.el9 |
| firefox-debuginfo | errata.rockylinux.org | 140.16.0-1.el9, 140.16.0-1.el8, 140.16.0-1.el10 |
| thunderbird | Amazon Linux | 140.16.0-1.amzn2.0.1 |
| firefox | Amazon Linux | 140.17.0-1.amzn2023.0.1 |
| firefox | mozilla | 140.16.0 |
| thunderbird | mozilla | 140.16.0 |
Risk scores
CVSS 3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 140.16 |
| Mozilla | Thunderbird | 140.16 |
| Mozilla | Thunderbird | 140.16 |
| Mozilla | Firefox | 140.16 |
| amazon:2 | thunderbird | 0 |
| amazon:2023 | firefox | 0 |
Timeline
- Sep 15, 2026 CVE Published
- Sep 16, 2026 EPSS Score (16 in total, the first dated here)
- Sep 22, 2026 Distribution Patch (17 in total, the first dated here)
- Sep 22, 2026 Security Advisory (12 in total, the first dated here)
- Oct 6, 2026 CVE Updated
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-92021
vulnetix vdb fixes CVE-2026-92021Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-92021/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart