CVE-2024-21486: 
Rust vulnerability analysis and mitigation

CVE-2024-21486 affects Deno runtime versions prior to 2.0.0, where static imports are exempted from the network permission check. The vulnerability was discovered and disclosed in June 2025, impacting the core security model of the Deno runtime environment (GitHub Advisory).

The vulnerability stems from static imports being exempted from network permission checks in Deno. This security flaw has a CVSS v3.1 Base Score of 5.3 (Moderate) with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, indicating network vector attack capability with low complexity and no required privileges or user interaction (GitHub Advisory).

The vulnerability can be exploited in two primary ways: attackers can implement tracking pixel-like imports to monitor when developers use attacker-controlled code, and when combined with --allow-write and --allow-read permissions, attackers can perform a two-step attack to exfiltrate sensitive information such as password files, even without explicit network permissions (GitHub Advisory).

The vulnerability has been patched in Deno version 2.0.0 with the introduction of the --allow-import flag. Users should upgrade to this version or later to mitigate the risk. The new security model requires explicit permission for imports through the --allow-import flag (GitHub Advisory).