What’s Vulnerable › Vulnerabilities

CVE-2024-49770: oak's path traversal allows transfer of hidden files within the served root directory

• Severity: high (CVSS 7.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-01 · updated 2026-06-17
• Weakness: CWE-22

Description

`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.

Affected products

• oakserver oak: before 17.1.3 — fixed in 17.1.3

How to fix

Upgrade to a fixed version: oakserver oak 17.1.3. Check the vendor advisory for mitigations.

References

• https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L117-L125
• https://github.com/oakserver/oak/blob/3896fe568b25ac0b4c5afbf822ff8344c3d1712a/send.ts#L182C10-L182C25
• https://github.com/oakserver/oak/commit/4b2f27efd5cba5a45b2c3982e610da3af0869209
• https://github.com/oakserver/oak/security/advisories/GHSA-qm92-93fv-vh7m

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