CVE-2026-125110

What it is

Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Static serves a path after Utils.clean_path_info normalization but evaluates header_rules against a path that is only URL-decoded. An unauthenticated attacker can request a known file through raw or percent-encoded dot segments and receive it without path-specific security headers such as Content-Disposition or Content-Security-Policy. Applications that do not use path-specific header_rules are not affected. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-11-09 17:45 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-11-09 22:00 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-11-09 22:00 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-11-09 22:00 UTC

Last modified

2026-11-09 22:00 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-180

Record status

Received

Affected

• Rack < 2.2.25
• Rack >= 3.0, < 3.1.23
• Rack >= 3.2, < 3.2.8

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-125110.md and follow it. Check whether this project is affected by CVE-2026-125110. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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