Detections
Analytics

SCA: security update for rack (GHSA-v6x5-cg8r-vv6x)

high Tenable Self-Hosted Container Security Plugin ID 439703

Description

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

 - Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to
 before 3.2.6, Rack::Multipart::Parser#handle_mime_head parses quoted multipart parameters such as Content-
 Disposition: form-data; name="..." using repeated String#index searches combined with String#slice! prefix
 deletion. For escape-heavy quoted values, this causes super-linear processing. An unauthenticated attacker
 can send a crafted multipart/form-data request containing many parts with long backslash-escaped parameter
 values to trigger excessive CPU usage during multipart parsing. This results in a denial of service
 condition in Rack applications that accept multipart form data. This issue has been patched in versions
 3.1.21 and 3.2.6. (CVE-2026-34827)

Solution

Update the rack library and its related packages to version 3.1.21 or later.

See Also

https://github.com/advisories/GHSA-v6x5-cg8r-vv6x

Plugin Details

Severity: High

ID: 439703

Version: Revision 1.4

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: 3

Percentile: 23.72

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-2026-34827

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: 4/2/2026

Vulnerability Publication Date: 4/2/2026

Reference Information

CVE: CVE-2026-34827