SCA: security update for pyasn1 (GHSA-jr27-m4p2-rc6r)

high Tenable Cloud Security Plugin ID 438887

Description

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

- pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` library is vulnerable to a
Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply
nested structures. An attacker can supply a crafted payload containing thousands of nested `SEQUENCE`
(`0x30`) or `SET` (`0x31`) tags with "Indefinite Length" (`0x80`) markers. This forces the decoder to
recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all
available memory (OOM), crashing the host application. This is a distinct vulnerability from
CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490
(`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this
specific issue. (CVE-2026-30922)

Solution

Update the pyasn1 library and its related packages to version 0.6.3 or later.

Plugin Details

Severity: High

ID: 438887

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 3/17/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.39

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-30922

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:N/A:H

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/17/2026

Vulnerability Publication Date: 3/17/2026

Reference Information

CVE: CVE-2026-30922

cwe: CWE-674

Detections

Analytics