Description
Fluxbox through 1.3.7 contains an infinite loop vulnerability in Menu::updateMenu() in src/FbTk/Menu.cc that allows attackers to hang the window manager via crafted style geometry values. Attackers can supply a style with an oversized unbounded menu.titleHeight so the column loop never terminates, causing sustained CPU use and denial of service at startup.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| fluxbox | fluxbox | ≤ 1.3.7 | — |
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 | fluxbox | No fix yet | — |
| Debian 13 | fluxbox | No fix yet | — |
| Debian 12 | fluxbox | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | fluxbox | No fix yet | — |
| Ubuntu 26.04 LTS | fluxbox | No fix yet | — |
| Ubuntu 24.04 LTS | fluxbox | No fix yet | — |
| Ubuntu 22.04 LTS | fluxbox | No fix yet | — |
| Ubuntu 20.04 LTS | fluxbox | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | fluxbox | No fix yet | — |
| Ubuntu 16.04 LTS | fluxbox | No fix yet | — |
References
- Pull Request #90 issue-tracking patch
- https://github.com/fluxbox/fluxbox product
- Menu::updateMenu column loop technical-description
- VulnCheck Advisory: Fluxbox through 1.3.7 Infinite Loop via Menu::updateMenu() Style Geometry third-party-advisory