CVE-2026-54162 Ember: Unneutralised terminal escape/control sequences from Caddy logs injected into the operator's TUI
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-54162?
CVE-2026-54162 is a medium-severity vulnerability in alexandre-daubois ember, published on 28 Oct 2026.
Official description
Ember is a real-time terminal dashboard for Caddy servers with FrankenPHP support. Prior to 1.4.2, interactive TUI row formatters pass Caddy access-log fields, particularly the request URI, through the `fitCellLeft` render helper without neutralizing terminal escape or control sequences. An unauthenticated remote client can place ANSI, OSC, or CSI control bytes in an ordinary HTTP request target. Caddy JSON-escapes those bytes, `ParseLogLine` decodes them back into raw controls, and the formatters concatenate them into `View()` output reaching `os.Stdout`. When the operator views the default `Logs` tab, the terminal interprets these sequences, allowing monitoring-dashboard spoofing, clipboard hijacking through `OSC 52`, and window-title spoofing through `OSC 0/2`. This works even with a loopback-only log listener because the input arrives through normal Caddy access logs. `Certificates` and `Routes` share secondary unneutralized render sinks. The `--json`, `--once`, and daemon `--expose` modes are unaffected because they do not render an interactive terminal. Consequences depend on the terminal emulator and usually require further operator action to escalate; this is not general-purpose remote code execution. This issue is fixed in version 1.4.2.
Weakness: CWE-150
Which versions are affected by CVE-2026-54162?
3 open source packages ship an affected version, including github.com/alexandre-daubois/ember.
| Package | Affected | Fixed in |
|---|---|---|
github.com/alexandre-daubois/ember Go | All versions | 1.4.2 |
github.com/alexandre-daubois/ember Go | All versions | 1.4.2 |
github.com/alexandre-daubois/ember Go | All versions | 1.4.2 |
How do I fix CVE-2026-54162?
Upgrade github.com/alexandre-daubois/ember to 1.4.2 or later.
Is CVE-2026-54162 being exploited?
There is no known exploitation of CVE-2026-54162 in the wild and no public exploit code.
Sources
Also known as GHSA-x3g7-qrwc-f6c5, GO-2026-6270.