SCA: security update for rfc3161-client (GHSA-3xxc-pwj6-jgrj)

high Tenable Cloud Security Plugin ID 440073

Description

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

- rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior
to 1.0.6, an Authorization Bypass vulnerability in rfc3161-client's signature verification allows any
attacker to impersonate a trusted TimeStamping Authority (TSA). By exploiting a logic flaw in how the
library extracts the leaf certificate from an unordered PKCS#7 bag of certificates, an attacker can append
a spoofed certificate matching the target common_name and Extended Key Usage (EKU) requirements. This
tricks the library into verifying these authorization rules against the forged certificate while
validating the cryptographic signature against an actual trusted TSA (such as FreeTSA), thereby bypassing
the intended TSA authorization pinning entirely. This vulnerability is fixed in 1.0.6. (CVE-2026-33753)

Solution

Update the rfc3161-client library and its related packages to version 1.0.6 or later.

Plugin Details

Severity: High

ID: 440073

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 4/8/2026

Updated: 6/1/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.76

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-33753

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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: 4/8/2026

Vulnerability Publication Date: 4/8/2026

Reference Information

CVE: CVE-2026-33753

cwe: CWE-295

Detections

Analytics