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CVE-2025-47908

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Date: August 6, 2025

Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.

Severity Score

Related Resources (7)

https://pkg.go.dev/vuln/GO-2024-2883
https://github.com/rs/cors
https://github.com/rs/cors/issues/170
https://github.com/rs/cors/commit/4c32059b2756926619f6bf70281b91be7b5dddb2
https://github.com/rs/cors/pull/171
https://nvd.nist.gov/vuln/detail/CVE-2025-47908
https://www.mend.io/vulnerability-database/CVE-2025-47908

Severity Score

Weakness Type (CWE)

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade to version github.com/rs/cors - v1.11.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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