Detections
Analytics
SCA: security update for rack-session (GHSA-33qg-7wpp-89cq)
critical Tenable Self-Hosted Container Security Plugin ID 440003
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- Rack::Session is a session management implementation for Rack. From 2.0.0 to before 2.1.2,
Rack::Session::Cookie incorrectly handles decryption failures when configured with secrets:. If cookie
decryption fails, the implementation falls back to a default decoder instead of rejecting the cookie. This
allows an unauthenticated attacker to supply a crafted session cookie that is accepted as valid session
data without knowledge of any configured secret. Because this mechanism is used to load session state, an
attacker can manipulate session contents and potentially gain unauthorized access. This vulnerability is
fixed in 2.1.2. (CVE-2026-39324)
Solution
Update the rack-session library and its related packages to version 2.1.2 or later.See Also
Plugin Details
Severity: Critical
ID: 440003
Version: Revision 1.12
Type: Local
Family: SCA Checks
Published: 4/8/2026
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Medium
Score: 4.9
Percentile: 57.88
Vendor
Vendor Severity: Critical
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-39324
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.3
Threat Score: 8.9
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 4/8/2026
Vulnerability Publication Date: 4/7/2026
Reference Information
CVE: CVE-2026-39324