CVE-2025-66457

Description

Arbitrary code execution from cookie config. If dynamic cookies are enabled (ie there exists a schema for cookies), the cookie config is injected into the compiled route without first being sanitised. Availability of this exploit is generally low, as it requires write access to either the Elysia app's source code (in which case the vulnerability is meaningless) or write access to the cookie config (perhaps where it is assumed to be provisioned by the environment). However when combined with GHSA-hxj9-33pp-j2cc, this vulnerability allows for a full RCE chain. ### Impact - aot enabled (default) - cookie schema passed to route - Cookie config controllable eg. via env Example of vulnerable code ```js new Elysia({ cookie: { secrets: `' + console.log('pwned from secrets') + '` }, }) .get("/", () => "hello world", { cookie: t.Cookie({ foo: t.Any(), }), }) ``` POC: https://github.com/sportshead/elysia-poc ### Patches Patched by 1.4.17 (https://github.com/elysiajs/elysia/pull/1564) Reference commit: - https://github.com/elysiajs/elysia/pull/1564/commits/26935bf76ebc43b4a43d48b173fc853de43bb51e - https://github.com/elysiajs/elysia/pull/1564/commits/3af978663e437dccc6c1a2a3aff4b74e1574849e ### Workarounds Sanitize cookie-related env input ```typescript const overrideUnsafeQuote = (value: string) => // '`' + value + '`' '`' + value.replace(/'/g, '\\`').replace(/\${/g, '$\\{') + '`' ```

How to fix CVE-2025-66457

To remediate CVE-2025-66457, upgrade the affected package to a fixed version below.

• —upgrade to 1.4.18 or later

Is CVE-2025-66457 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1.4.18

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-66457
• PATCHgithub.com/elysiajs/elysia
• WEBgithub.com/elysiajs/elysia/commit/26935bf76ebc43b4a43d48b173fc853de43bb51e
• WEBgithub.com/elysiajs/elysia/commit/3af978663e437dccc6c1a2a3aff4b74e1574849e