CVE-2026-0885: Use-after-free in the JavaScript: GC component
Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.
Other sources
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
— Ubuntu
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 147 - Upgrade
Upgrade
ubuntu/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.7.1+build1-0ubuntu0.22.04.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.7 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 160.0-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 140.12.0esr-1~deb12u1Fixed in 153.7.0esr-1~deb12u1Fixed in 140.15.0esr-1~deb13u1Fixed in 153.7.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.7.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.7.0esr-1~deb12u1Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.7.0esr-1~deb13u1Fixed in 1:153.5.0esr-1Fixed in 1:153.7.0esr-1 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 140.7 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 140.7
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2026-0885?
CVE-2026-0885 is considered a high severity vulnerability due to its potential for exploitation through use-after-free conditions.
How do I fix CVE-2026-0885?
To fix CVE-2026-0885, users should update to Firefox version 147 or Firefox ESR version 140.7 or later.
What versions of Firefox are affected by CVE-2026-0885?
CVE-2026-0885 affects Firefox versions prior to 147 and Firefox ESR versions prior to 140.7.
What is a use-after-free vulnerability in the context of CVE-2026-0885?
A use-after-free vulnerability, like CVE-2026-0885, occurs when a program continues to use a memory reference after it has been freed, potentially leading to arbitrary code execution.
Is CVE-2026-0885 exploitable remotely?
Yes, CVE-2026-0885 can be exploited remotely, allowing attackers to execute arbitrary code on the affected system.