Description
Integer underflow in Brotli, as used in Mozilla Firefox before 45.0, allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow) via crafted data with brotli compression.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | brotli | 0.3.0+dfsg-3 | — |
| Debian 14 | firefox-esr | 45.0esr-1 | — |
| Debian 13 | brotli | 0.3.0+dfsg-3 | — |
| Debian 13 | firefox-esr | 45.0esr-1 | — |
| Debian 12 | brotli | 0.3.0+dfsg-3 | — |
| Debian 12 | firefox-esr | 45.0esr-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | brotli | 0.3.0+dfsg-2ubuntu1 | — |
| Ubuntu 14.04 LTS | firefox | 45.0+build2-0ubuntu0.14.04.1 | USN-2917-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 3
- USN-2917-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- openSUSE-SU-2016:0731 vendor-advisory
- http://www.mozilla.org/security/announce/2016/mfsa2016-30.html
- USN-2917-1 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1246742
- openSUSE-SU-2016:0733 vendor-advisory
- 1035215 vdb-entry
- GLSA-201605-06 vendor-advisory
- USN-2917-2 vendor-advisory
- USN-2917-3 vendor-advisory