Description
Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser can retain parsed data in its internal StringScanner buffer when reads end inside or immediately after multipart headers. An unauthenticated attacker can align many small parts with rack.multipart.buffer_size boundaries so the buffer grows with the request despite per-field, header, and preamble limits, causing a worker to exhaust memory. The attack requires only a well-formed multipart body and affects applications that parse multipart requests. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.
Published: 2026-11-09
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
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
Github GHSA Github GHSA GHSA-5v64-555j-wjxm Rack: Multipart parsing allows DoS via unbounded scan buffer growth
History

Tue, 10 Nov 2026 00:15:00 +0000

Type Values Removed Values Added
First Time appeared Rack
Rack rack
Vendors & Products Rack
Rack rack

Mon, 09 Nov 2026 22:15:00 +0000

Type Values Removed Values Added
Description Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser can retain parsed data in its internal StringScanner buffer when reads end inside or immediately after multipart headers. An unauthenticated attacker can align many small parts with rack.multipart.buffer_size boundaries so the buffer grows with the request despite per-field, header, and preamble limits, causing a worker to exhaust memory. The attack requires only a well-formed multipart body and affects applications that parse multipart requests. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.
Title Rack: Multipart parsing allows DoS via unbounded scan buffer growth
Weaknesses CWE-400
References
Metrics 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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-11-09T22:02:38.334Z

Reserved: 2026-11-09T17:45:35.936Z

Link: CVE-2026-125111

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-09T22:18:42.433

Modified: 2026-11-09T22:18:42.433

Link: CVE-2026-125111

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-10T00:00:11Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption