Uncontrolled Recursion in py-asn1 - CVE-2026-30922

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Main Vulnerability Database Vulnerabilities #VU128152

Uncontrolled Recursion in py-asn1 - CVE-2026-30922

Published: April 27, 2026


Vulnerability identifier: #VU128152
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-30922
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in the pyasn1 BER decoder when decoding deeply nested ASN.1 data with indefinite-length constructed types. A remote attacker can supply a specially crafted payload containing nested SEQUENCE or SET tags to cause a denial of service.

Services that parse untrusted ASN.1 data may terminate with a RecursionError or exhaust available memory.


Affected software

py-asn1
Fusion Content-Aware Storage
Maximo Application Suite - Predict Component
Maximo Application Suite - Visual Inspection Component
Data Cataloging
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Micro
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Ubuntu
Public Cloud Module
Basesystem Module
Python 3 Module
openSUSE Leap
openEuler
IBM Fusion HCI
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data
IBM Watson Discovery for IBM Cloud Pak for Data
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
pyasn1 (Ubuntu package)
python3-pyasn1
python-pyasn1
python-pyasn1-help
python2-pyasn1
python311-pyasn1
python3-pyasn1-modules
python3-pyasn1-doc
resource-agents (Red Hat package)
fence-agents (Red Hat package)
resource-agents
resource-agents-aliyun
resource-agents-gcp
resource-agents-paf

How to mitigate CVE-2026-30922

Install security update from vendor's website.

py-asn1 - update to 0.6.3
Fusion Content-Aware Storage - update to 1.1.3
IBM Fusion HCI - update to 2.13.0
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data - update to 5.3.1 Patch 5
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
Maximo Application Suite - Predict Component - addressed in versions 8.8.15, 8.9.17, 9.0.14, 9.1.7
Maximo Application Suite - Visual Inspection Component - addressed in versions 9.0.19, 9.1.12
pyasn1 (Ubuntu package) - addressed in versions 0.1.7-1ubuntu2.1+esm1, 0.1.9-1ubuntu0.1~esm1, 0.4.2-3ubuntu0.18.04.1~esm1, 0.4.2-3ubuntu0.20.04.1~esm1, 0.4.8-1ubuntu0.2, 0.4.8-4ubuntu0.2, 0.6.1-1ubuntu0.2
python3-pyasn1 - addressed in versions 0.1.9-4.14.1, 0.4.2-150000.3.16.1
python-pyasn1 - update to 0.1.9-4.14.1
python-pyasn1 - addressed in versions 0.4.8-3, 0.4.8-5, 0.5.1-3
python-pyasn1-help - addressed in versions 0.4.8-3, 0.4.8-5, 0.5.1-3
python2-pyasn1 - update to 0.4.8-3
python3-pyasn1 - addressed in versions 0.4.8-3, 0.4.8-5, 0.5.1-3
python311-pyasn1 - addressed in versions 0.5.0-4.1, 0.5.0-150400.12.13.1
python3-pyasn1-modules - update to 0.6.2-3
python3-pyasn1-doc - update to 0.6.2-3
python3-pyasn1 - update to 0.6.2-3
Data Cataloging - update to 2.5.3
resource-agents (Red Hat package) - addressed in versions 4.1.1-90.el8_4.25, 4.9.0-16.el8_6.22, 4.9.0-40.el8_8.19, 4.9.0-54.el8_10.33
fence-agents (Red Hat package) - addressed in versions 4.2.1-129.el8_10.25, 4.10.0-43.el9_2.22, 4.10.0-86.el9_6.17, 4.10.0-98.el9_7.13, 4.16.0-5.el10_0.9, 4.16.0-13.el10_1.4
resource-agents - update to 4.9.0-54
resource-agents-aliyun - update to 4.9.0-54
resource-agents-gcp - update to 4.9.0-54
resource-agents-paf - update to 4.9.0-54

External References

Related Security Bulletins