VDB
DEBIAN-CVE-2026-2771
DEBIAN-CVE-2026-2771
PUBLISHED
CVSS 9.800000190734863 CRITICAL
Record from OSV · Published February 24, 2026
Undefined behavior in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| thunderbird | Debian:12 | 1:140.8.0esr-1~deb12u1 |
| thunderbird | Debian:14 | 1:140.8.0esr-1 |
| firefox-esr | Debian:12 | 140.8.0esr-1~deb12u1 |
| thunderbird | Debian:13 | 1:140.8.0esr-1~deb13u1 |
| firefox-esr | Debian:14 | 140.8.0esr-1 |
| firefox-esr | Debian:13 | 140.8.0esr-1~deb13u1 |
Risk scores
CVSS 3.1
9.800000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | thunderbird | 1:115.2.2-1, 1:102.11.0-1, 1:102.12.0-1 |
| Debian:14 | thunderbird | 0, 1:140.8.0esr-1~deb11u1, 1:140.7.1esr-1~deb13u1 |
| Debian:12 | firefox-esr | 140.8.0esr-1~deb11u1, 115.2.0esr-1, 115.2.1esr-1 |
| Debian:13 | thunderbird | 1:137.0-1, 1:138.0-1, 1:140.0.1esr-1 |
| Debian:14 | firefox-esr | 140.3.0esr-1~deb11u2, 0, 128.13.0esr-1 |
| Debian:13 | firefox-esr | 140.8.0esr-1~deb11u1, 140.7.0esr-1~deb13u1, 140.7.0esr-1~deb12u1 |
Timeline
- Feb 24, 2026 CVE Published
- Oct 1, 2026 CVE Updated
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln DEBIAN-CVE-2026-2771
vulnetix vdb fixes DEBIAN-CVE-2026-2771Or with curl, using the org id and key from your account page:
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