CVE-2026-45036 Command injection in tabby
Tabby terminal emulator allows remote code execution via crafted file content due to automatic ZMODEM protocol confirmation injecting shell commands.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-45036?
CVE-2026-45036 is a high-severity command injection vulnerability in Eugeny tabby, published on 15 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Tabby (formerly Terminus) is a highly configurable terminal emulator. Prior to 1.0.233, Tabby before 1.0.233 automatically confirms ZMODEM protocol detection on all terminal session output without user interaction, enabling shell command execution when a user displays attacker-controlled content. The ZModemMiddleware in tabby-terminal consumes all session output through a Zmodem.Sentry, and when a ZMODEM ZRQINIT header is detected, unconditionally calls detection.confirm() and writes a fixed ZRINIT response ( **\x18B0100000023be50\r\n\x11) back into the active PTY as input. When the process that triggered the detection (e.g., cat) exits, the injected bytes are consumed by the user's shell as a command line. Under fish (default configuration), the ** prefix triggers recursive glob expansion against the current directory, allowing an attacker-placed executable at a matching nested path (e.g., d/xB0100000023be50) to be executed by relative pathname without relying on PATH. Under bash and zsh, a secondary xterm.js terminal color-query feedback (OSC 10) can be combined in the same file to inject a slash-containing command word that similarly bypasses PATH resolution. An attacker can exploit this by providing a crafted file (e.g., in a cloned Git repository) that a user displays with cat, achieving code execution with no interaction beyond viewing the file. This vulnerability is fixed in 1.0.233.
Weakness: CWE-78
Which versions are affected by CVE-2026-45036?
It affects 1 product.
Products include Tabby Tabby.
How do I fix CVE-2026-45036?
No fix has been published for CVE-2026-45036 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-45036 being exploited?
There is no known exploitation of CVE-2026-45036 in the wild and no public exploit code.
Other vulnerabilities in Eugeny tabby
- CVE-2026-45035 Tabby: RCE via `tabby://run` URL Scheme
- CVE-2026-45038 Tabby: Dragging and Dropping a File into Tabby Can Lead to Code Execution
- CVE-2026-46709 Tabby: Drag-and-drop path injection still allows RCE via shell command substitution (incomplete fix for CVE-2026-45038)
- CVE-2026-45037 Tabby: Unsafe protocol handler execution via terminal linkifier allows arbitrary OS protocol invocation
Sources
Also known as GHSA-qr3x-j8g9-xhf6.