DEBIAN-CVE-2026-6785
Record from OSV · Published April 26, 2026
Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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 | 1:140.10.0esr-1~deb12u1 |
| firefox-esr | Debian:12 | 140.10.0esr-1~deb12u1 |
| thunderbird | Debian:13 | 1:140.10.0esr-1~deb13u1 |
| thunderbird | Debian:14 | 1:140.10.0esr-1 |
| firefox-esr | Debian:14 | 140.10.0esr-1 |
| firefox-esr | Debian:13 | 140.10.0esr-1~deb13u1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | thunderbird | 0, 1:102.11.0-1, 1:102.12.0-1 |
| Debian:12 | firefox-esr | 140.9.1esr-1~deb13u1, 0, 102.11.0esr-1 |
| Debian:13 | thunderbird | 0, 1:140.9.1esr-1~deb13u1, 1:140.9.1esr-1~deb12u1 |
| Debian:14 | thunderbird | 1:140.1.1esr-1, 0, 1:128.13.0esr-1 |
| Debian:14 | firefox-esr | 140.6.0esr-1, 140.5.0esr-1~deb13u1, 140.5.0esr-1~deb12u1 |
| Debian:13 | firefox-esr | 128.14.0esr-1, 140.4.0esr-1~deb11u1, 140.4.0esr-1~deb12u1 |
Timeline
- Apr 26, 2026 CVE Published
- Oct 26, 2026 CVE Updated
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