{"id":"GHSA-x3g7-qrwc-f6c5","summary":"Ember has unneutralized terminal escape/control sequences from Caddy logs injected into the operator's TUI","details":"## Summary\n\nEmber's interactive TUI renders fields taken from the monitored Caddy server's access logs — most notably the request URI — straight to the operator's terminal without neutralising terminal escape or control sequences (CWE-150). Those log fields are populated from arbitrary, unauthenticated HTTP requests, so any remote client can embed ANSI/OSC/CSI control bytes that the operator's terminal emulator interprets when the log row is displayed. The bytes survive the whole pipeline: Caddy escapes them into its JSON access log as unicode escapes, ember's `ParseLogLine` decodes them back to raw `0x1b`/`0x07` bytes, and the row formatters concatenate them into the bubbletea `View()` output with no encoding before they reach `os.Stdout`.\n\n## Impact\n\nAn **unauthenticated, remote** attacker who can send HTTP requests to the Caddy server that ember monitors can inject terminal escape sequences into the operator's TUI. The trigger is a single ordinary HTTP request with control bytes in the request target. It requires no authentication; because the payload is reflected through Caddy's normal access log, it works even when ember's log listener is bound only to loopback. When the operator views the Logs tab — ember's default, zero-config mode — the terminal emulator interprets the injected sequences. Broadly-supported, demonstrated impact includes:\n\n- **Monitoring-dashboard spoofing** — CSI cursor/erase/scroll sequences forge or hide log rows so the operator misjudges the monitored server's state.\n- **Clipboard hijacking (OSC 52)** — attacker-chosen text is written into the operator's system clipboard, staging a payload the operator may later paste into a shell.\n- **Window-title spoofing (OSC 0/2)** — to support social engineering.\n\nThe impact ceiling depends on the operator's terminal emulator and usually requires a further operator action (e.g. a paste) to fully escalate; this is not general-case RCE, though specific terminal emulators have historically escalated escape sequences further. The Certificates and Routes tabs share the same unneutralised render path as secondary sinks. The `--json`/`--once` and daemon (`--expose`) modes are not affected, as they do not render to an interactive terminal.\n\n## References\n\n- https://github.com/alexandre-daubois/ember/blob/main/internal/ui/logtable.go#L18 — the unneutralised render helper (`fitCellLeft`) and row formatters (the sink)\n- https://github.com/alexandre-daubois/ember/blob/main/internal/fetcher/lognetlistener.go — the unauthenticated TCP access-log listener (input source)\n- https://github.com/alexandre-daubois/ember/blob/main/internal/fetcher/logentry.go — `ParseLogLine`, where the JSON decode restores raw control bytes\n- https://cwe.mitre.org/data/definitions/150.html — CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences","aliases":["CVE-2026-54162","GO-2026-6270"],"modified":"2026-09-10T03:50:54.262435793Z","published":"2026-08-20T18:36:01Z","database_specific":{"cwe_ids":["CWE-150"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-08-20T18:36:01Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/alexandre-daubois/ember/security/advisories/GHSA-x3g7-qrwc-f6c5"},{"type":"WEB","url":"https://github.com/alexandre-daubois/ember/commit/fcb7160e58dba58d6f9b5033cc312fdedc8c9f6b"},{"type":"PACKAGE","url":"https://github.com/alexandre-daubois/ember"},{"type":"WEB","url":"https://github.com/alexandre-daubois/ember/releases/tag/v1.4.2"}],"affected":[{"package":{"name":"github.com/alexandre-daubois/ember","ecosystem":"Go","purl":"pkg:golang/github.com/alexandre-daubois/ember"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.4.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-x3g7-qrwc-f6c5/GHSA-x3g7-qrwc-f6c5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N"}]}