CVE-2026-54699: Warp Development Environment RCE Vulnerability

CVE-2026-54699 Overview

CVE-2026-54699 is an OS command injection vulnerability [CWE-78] in Warp, an agentic development environment. The flaw exists in the Windows Subsystem for Linux (WSL) URL-opening fallback path. When Warp runs under WSL and cannot open a URL through wslview, it falls back to a Windows command processor. Attacker-controlled URLs rendered through terminal output can reach that fallback when a user clicks them, leading to command execution on the Windows host. Versions from 0.2024.03.12.08.02.stable_01 through 0.2026.05.06.15.42.stable_01 are affected. The issue is fixed in 0.2026.05.06.15.42.stable_01.

Critical Impact
A user opening a crafted link in a WSL-hosted Warp session can trigger Windows command execution, compromising confidentiality, integrity, and availability of the host.

Affected Products

Warp terminal versions 0.2024.03.12.08.02.stable_01 through versions prior to 0.2026.05.06.15.42.stable_01
Warp running under Windows Subsystem for Linux (WSL)
Warp 0.2026.05.06.15.42.stable_01 and later contain the fix

Discovery Timeline

2026-06-24 - CVE-2026-54699 published to NVD
2026-06-25 - Last updated in NVD database

Technical Details for CVE-2026-54699

Vulnerability Analysis

Warp renders clickable URLs from terminal output and opens them through a platform-appropriate handler. Under WSL, Warp first attempts wslview to invoke the Windows default browser. When that path fails, Warp falls back to invoking a Windows command processor to launch the URL. The fallback did not sanitize the URL string before passing it to the command processor.

An attacker who controls terminal output, for example through a malicious log file, cat of a crafted file, SSH banner, or output from a tool, can plant a URL that embeds command processor metacharacters. When the user clicks that URL, the unsanitized string reaches the fallback execution path and runs as a command on the Windows host.

Exploitation requires user interaction and a specific local configuration: Warp inside WSL with the wslview path failing. These prerequisites raise attack complexity, but successful exploitation crosses the WSL/Windows trust boundary and executes code outside the Linux sandbox.

Root Cause

The root cause is missing input sanitization on URL strings passed to the Windows command processor in the WSL fallback. The fix introduces the url crate as a workspace dependency and parses URLs before handing them to the shell, ensuring metacharacters cannot break out of the URL argument context.

Attack Vector

The attack is local and requires user interaction. An attacker stages malicious content that Warp will render as a clickable link inside a WSL session. The victim clicks the link, the wslview invocation fails, and the unsanitized URL flows into the Windows command processor fallback, executing attacker-supplied commands.

text

// Patch excerpt: Cargo.lock — adds the `url` crate for URL parsing/sanitization
  "tauri-winrt-notification",
  "thiserror 2.0.17",
  "tini",
+ "url",
  "urlencoding",
  "vec1",
  "version-compare",

Source: GitHub Commit c66cff4

text

// Patch excerpt: crates/warpui/Cargo.toml — pulls in `url` on Linux/FreeBSD targets (covers WSL)
 [target.'cfg(any(target_os = "linux", target_os = "freebsd"))'.dependencies]
 blocking.workspace = true
 dirs.workspace = true
+url.workspace = true
 fontconfig = { version = "0.8.0", features = ["dlopen"] }

Source: GitHub Commit c66cff4

Detection Methods for CVE-2026-54699

Indicators of Compromise

Unexpected child processes of the Warp process tree spawning cmd.exe, powershell.exe, or conhost.exe from a WSL context
Windows process creation events where the command line contains URL-derived strings with shell metacharacters such as &, |, ^, or backticks
WSL interop calls invoking Windows binaries shortly after a user clicks a link in Warp
Warp installations on Windows hosts running versions between 0.2024.03.12.08.02.stable_01 and 0.2026.05.06.15.42.stable_01

Detection Strategies

Monitor Windows Event ID 4688 and Sysmon Event ID 1 for cmd.exe or powershell.exe parented by WSL interop processes (wslhost.exe, init) tied to Warp
Hunt for command lines that combine a URL scheme prefix with shell control characters
Inventory installed Warp versions across developer workstations and flag any below 0.2026.05.06.15.42.stable_01

Monitoring Recommendations

Enable Sysmon process creation logging on developer endpoints that run WSL and forward to a central analytics platform
Alert on any non-browser executable launched as a direct or indirect child of Warp following a URL-open event
Track outbound network connections initiated by cmd.exe or powershell.exe spawned through WSL interop

How to Mitigate CVE-2026-54699

Immediate Actions Required

Upgrade Warp to version 0.2026.05.06.15.42.stable_01 or later on all systems where it runs under WSL
Audit developer workstations for vulnerable Warp builds and prioritize hosts that regularly process untrusted terminal output
Instruct users to avoid clicking links rendered from untrusted command output until the upgrade is deployed

Patch Information

The maintainers shipped the fix in Warp 0.2026.05.06.15.42.stable_01. The patch adds the url crate to the WSL build configuration and sanitizes URLs before they reach the Windows command processor fallback. Review the GitHub Security Advisory GHSA-xmw3-wj6r-48m4 and the fix commit for full details.

Workarounds

Ensure wslview (provided by wslu) is installed and functional inside the WSL distribution so the vulnerable fallback path is never reached
Avoid running Warp inside WSL until the upgrade is applied; use the native Windows or Linux build where feasible
Refrain from rendering or interacting with terminal output from untrusted sources, including remote logs, third-party SSH servers, and attacker-controlled files

bash

# Verify Warp version and ensure wslview is available inside WSL
warp --version
command -v wslview || sudo apt-get install -y wslu

# Confirm wslview can open a benign URL before relying on it
wslview "https://example.com"