Detections
Analytics

SCA: security update for rack (GHSA-g2pf-xv49-m2h5)

medium Tenable Self-Hosted Container Security Plugin ID 439697

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::Request parses the Host header using an AUTHORITY regular expression that accepts
 characters not permitted in RFC-compliant hostnames, including /, ?, #, and @. Because req.host returns
 the full parsed value, applications that validate hosts using naive prefix or suffix checks can be
 bypassed. This can lead to host header poisoning in applications that use req.host, req.url, or
 req.base_url for link generation, redirects, or origin validation. This issue has been patched in versions
 3.1.21 and 3.2.6. (CVE-2026-34835)

Solution

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

See Also

https://github.com/advisories/GHSA-g2pf-xv49-m2h5

Plugin Details

Severity: Medium

ID: 439697

Version: Revision 1.6

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: 2.1

Percentile: 7.71

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2026-34835

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/2/2026

Vulnerability Publication Date: 4/2/2026

Reference Information

CVE: CVE-2026-34835