Description
uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of parameter nesting for strict blocking, which allows crafted web sites to cause a denial of service (unbounded recursion that can trigger memory consumption and a loss of all blocking functionality).
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 | ublock-origin | 1.37.0+dfsg-1 | — |
| Debian 13 | ublock-origin | 1.37.0+dfsg-1 | — |
| Debian 12 | ublock-origin | 1.37.0+dfsg-1 | — |
| Debian 9 | ublock-origin | 1.42.0+dfsg-1~deb9u1 | DLA-3062-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | ublock-origin | No fix yet | — |
| Ubuntu 22.04 LTS | umatrix +1 | No fix yet | — |
| Ubuntu 20.04 LTS | umatrix +1 | No fix yet | — |
| Ubuntu 18.04 LTS | ublock-origin | No fix yet | — |
| Ubuntu 16.04 LTS | ublock-origin | No fix yet | — |
Advisories 1
- DLA-3062-1 ublock-origin - security update Debian Security (DSA / DLA) · Mar 9, 2026