Rack up to 2.2.18/3.1.16/3.2.1 Rack::Multipart::Parser resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Rack up to 2.2.18/3.1.16/3.2.1. The impacted element is the function Rack::Multipart::Parser. The manipulation leads to resource consumption. This vulnerability is traded as CVE-2025-61770. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Rack up to 2.2.18/3.1.16/3.2.1 and classified as problematic. This issue affects the function Rack::Multipart::Parser. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slowdown due to garbage collection. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a preamble size limit (e.g., 16 KiB) or discard preamble data entirely. Workarounds include limiting total request body size at the proxy or web server level and monitoring memory and set per-process limits to prevent OOM conditions.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-61770 since 09/30/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 269982 (Ruby Rack < 2.2.19 / 3.1.x < 3.1.17 / 3.2.x < 3.2.2 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.2.19, 3.1.17 or 3.2.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (269982) and CERT Bund (WID-SEC-2025-2482). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Red Hat Enterprise Linux
  • Oracle Linux
  • RESF Rocky Linux

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 269982
Nessus Name: Ruby Rack < 2.2.19 / 3.1.x < 3.1.17 / 3.2.x < 3.2.2 Multiple Vulnerabilities

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Rack 2.2.19/3.1.17/3.2.2

Timelineinfo

09/30/2025 CVE reserved
10/07/2025 +7 days Advisory disclosed
10/07/2025 +0 days VulDB entry created
11/05/2025 +29 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-61770 (🔒)
GCVE (CVE): GCVE-0-2025-61770
GCVE (VulDB): GCVE-100-327389
CERT Bund: WID-SEC-2025-2482 - Red Hat Enterprise Linux: Mehrere Schwachstellen erm&ouml;glichen Denial of Service

Entryinfo

Created: 10/07/2025 16:55
Updated: 11/05/2025 16:37
Changes: 10/07/2025 16:55 (63), 10/11/2025 01:32 (2), 11/05/2025 16:37 (7)
Complete: 🔍
Cache ID: 216::103

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