Detections
Analytics

SCA: security update for rack (GHSA-vgpv-f759-9wx3)

medium Tenable Cloud Security Plugin ID 439702

Description

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

 - Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6,
 Rack::Multipart::Parser extracts the boundary parameter from multipart/form-data using a greedy regular
 expression. When a Content-Type header contains multiple boundary parameters, Rack selects the last one
 rather than the first. In deployments where an upstream proxy, WAF, or intermediary interprets the first
 boundary parameter, this mismatch can allow an attacker to smuggle multipart content past upstream
 inspection and have Rack parse a different body structure than the intermediary validated. This issue has
 been patched in versions 2.2.23, 3.1.21, and 3.2.6. (CVE-2026-26961)

Solution

Update the rack library and its related packages to version 2.2.23 or later.

See Also

https://github.com/advisories/GHSA-vgpv-f759-9wx3

Plugin Details

Severity: Medium

ID: 439702

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 4/3/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-26961

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 4/2/2026

Vulnerability Publication Date: 4/2/2026

Reference Information

CVE: CVE-2026-26961

cwe: CWE-436