Detections
Analytics

SCA: security update for rack (GHSA-w9pc-fmgc-vxvw)

high Tenable Self-Hosted Container Security Plugin ID 435527

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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` stores non-file form fields (parts without a `filename`) entirely in memory as
 Ruby `String` objects. A single large text field in a multipart/form-data request (hundreds of megabytes
 or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and
 denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage.
 Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-
 collection overhead. All Rack applications processing multipart form submissions are affected. Versions
 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds
 include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx
 `client_max_body_size`) and validating and rejecting unusually large form fields at the application level.
 (CVE-2025-61771)

See Also

https://github.com/advisories/GHSA-w9pc-fmgc-vxvw

Plugin Details

Severity: High

ID: 435527

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 10/7/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.88

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-61771

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/7/2025

Vulnerability Publication Date: 10/7/2025

Reference Information

CVE: CVE-2025-61771

IAVB: 2025-B-0167-S

cwe: CWE-400