Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | May 31, 2026 | May 27, 2026 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefox | Jun 9, 2026 | Jun 9, 2026 |
| Amazon_linux_2023 | — | Upgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsource | Jun 9, 2026 | May 19, 2026 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | May 24, 2026 | May 24, 2026 |
| Mfsa2026 46 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 151.0 | May 19, 2026 | May 19, 2026 |
| Mfsa2026 47 | — | Upgrade to Mozilla Firefox ESR version 115.36Upgrade to the latest version of Mozilla Firefox | May 19, 2026 | May 19, 2026 |
| Mfsa2026 48 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 140.11 | May 19, 2026 | May 19, 2026 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.11 | May 20, 2026 | May 19, 2026 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | May 29, 2026 | May 19, 2026 |
| Redhat_linux | — | Upgrade firefox-x11Upgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceNo solution existsUpgrade firefox-debuginfoUpgrade thunderbird-debuginfo | Jun 3, 2026 | May 19, 2026 |
| Rocky_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-x11Upgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsource | Jun 1, 2026 | May 29, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub