Description
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.
Published: 2025-08-06
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-23882 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.
Github GHSA Github GHSA GHSA-mh55-gqvf-xfwm Denial of service via malicious preflight requests in github.com/rs/cors
History

Tue, 12 Aug 2025 08:00:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang cors
Vendors & Products Golang
Golang cors

Thu, 07 Aug 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Thu, 07 Aug 2025 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Moderate


Wed, 06 Aug 2025 21:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Denial of service via malicious preflight requests in github.com/rs/cors
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2025-08-07T13:47:15.232Z

Reserved: 2025-05-13T23:31:29.597Z

Link: CVE-2025-47908

cve-icon Vulnrichment

Updated: 2025-08-07T13:46:45.866Z

cve-icon NVD

Status : Deferred

Published: 2025-08-06T21:15:29.313

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-47908

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-08-06T20:41:31Z

Links: CVE-2025-47908 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-08-12T07:49:26Z

Weaknesses