--- id: CVE-2026-59885 title: >- pyasn1: python-pyasn1: pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER (CVE-2026-59885) summary: >- A flaw was found in pyasn1, a Python library for Abstract Syntax Notation One (ASN.1). The BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs. A remote attacker cou… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cvssSource: vendor cwe: - CWE-1050 - CWE-400 - CWE-407 vendor: Red Hat product: Red Hat OpenShift AI 3.4 affected: - exploit_intelligence - lightspeed_core - migration_toolkit_for_applications 8 - migration_toolkit_for_containers - migration_toolkit_for_virtualization - openshift_lightspeed - openshift_service_mesh 3 - ai_inference_server - ansible_automation_platform 2 - ceph_storage 7 - ceph_storage 8 - ceph_storage 9 - enterprise_linux 10 - enterprise_linux 6 - enterprise_linux 7 - enterprise_linux 8 - enterprise_linux 9 - enterprise_linux_ai_rhel_ai 3 - openshift_ai_rhoai - openshift_container_platform 4 - openstack_platform 16.2 - openstack_platform 17.1 - openstack_platform 18.0 - satellite 6 - trusted_artifact_signer - service_telemetry_framework 1.5 - ansible_automation_platform_2_5_for_rhel 8 - ansible_automation_platform_2_5_for_rhel 9 - ansible_automation_platform_2_6_for_rhel 9 - ai_inference_server 3.3 - enterprise_linux_ai 3.3 - hardened_images - migration_toolkit_for_applications 8.2 - openshift_ai 2.25 - openshift_ai 3.4 - quay 3.10 - quay 3.12 - quay 3.15 - quay 3.16 - quay 3.9 patched: - ansible_automation_platform_2_5_for_rhel 8 - ansible_automation_platform_2_5_for_rhel 9 - ansible_automation_platform_2_6_for_rhel 9 - ai_inference_server 3.3 - enterprise_linux_ai 3.3 - hardened_images - migration_toolkit_for_applications 8.2 - openshift_ai 2.25 - openshift_ai 3.4 - quay 3.10 - quay 3.12 - quay 3.15 - quay 3.16 - quay 3.9 published: '2026-07-14' updated: '2026-09-21' sourceUpdated: '2026-09-21T10:33:57+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59885.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59885.json - url: 'https://access.redhat.com/security/cve/CVE-2026-59885' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2500380' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-59885' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59885' - url: >- https://github.com/pyasn1/pyasn1/commit/45bdb19eb7df4b3780fe9c912c63e99bffc39dd9 - url: 'https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4' - url: 'https://github.com/pyasn1/pyasn1/security/advisories/GHSA-8ppf-4f7h-5ppj' - url: 'https://access.redhat.com/errata/RHSA-2026:50319' - url: 'https://access.redhat.com/errata/RHSA-2026:50336' - url: 'https://access.redhat.com/errata/RHSA-2026:59518' - url: 'https://access.redhat.com/errata/RHSA-2026:62336' - url: 'https://access.redhat.com/errata/RHSA-2026:62335' - url: 'https://access.redhat.com/errata/RHSA-2026:40236' - url: 'https://access.redhat.com/errata/RHSA-2026:56347' - url: 'https://access.redhat.com/errata/RHSA-2026:65126' - url: 'https://access.redhat.com/errata/RHSA-2026:60520' - url: 'https://access.redhat.com/errata/RHSA-2026:53520' - url: 'https://access.redhat.com/errata/RHSA-2026:52968' - url: 'https://access.redhat.com/errata/RHSA-2026:48933' - url: 'https://access.redhat.com/errata/RHSA-2026:69255' - url: 'https://access.redhat.com/errata/RHSA-2026:50931' - url: 'https://github.com/pyasn1/pyasn1' - url: 'https://github.com/advisories/GHSA-8ppf-4f7h-5ppj' tags: - csaf - vex - red-hat - osv - pip - ghsa epss: 0.00335 epssPercentile: 0.26857 aliases: - GHSA-8ppf-4f7h-5ppj - PYSEC-2026-3456 ecosystem: pip ingestedAt: '2026-07-21T19:53:40.111Z' --- ## Overview A flaw was found in pyasn1, a Python library for Abstract Syntax Notation One (ASN.1). The BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs. A remote attacker could exploit this by providing a specially crafted payload containing an OID with many arcs, leading to excessive CPU consumption and a denial of service (DoS) in applications that decode untrusted ASN.1 data. The corresponding encoders also exhibit this quadratic behavior when re-encoding attacker-supplied values. ## Vendor advisories - **RHSA-2026:50319** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9 · released 2026-08-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:50319) - **RHSA-2026:50336** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.6 for RHEL 9 · released 2026-08-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:50336) - **RHSA-2026:59518** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59518) - **RHSA-2026:62336** · Red Hat · fixed in: Red Hat Enterprise Linux AI 3.3 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:62336) - **RHSA-2026:62335** · Red Hat · fixed in: Red Hat Enterprise Linux AI 3.3 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:62335) - **RHSA-2026:40236** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:40236) - **RHSA-2026:56347** · Red Hat · fixed in: Red Hat Migration Toolkit for Applications 8.2 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:56347) - **RHSA-2026:65126** · Red Hat · fixed in: Red Hat OpenShift AI 2.25 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65126) - **RHSA-2026:60520** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-08-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:60520) - **RHSA-2026:53520** · Red Hat · fixed in: Red Hat Quay 3.10 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53520) - **RHSA-2026:52968** · Red Hat · fixed in: Red Hat Quay 3.12 · released 2026-08-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:52968) - **Red Hat VEX** · Important · affected: Exploit Intelligence, Lightspeed Core, Migration Toolkit for Applications 8, Migration Toolkit for Containers, Migration Toolkit for Virtualization, OpenShift Lightspeed, … · no fix planned: Red Hat Enterprise Linux 6, Migration Toolkit for Virtualization, Red Hat AI Inference Server, Exploit Intelligence, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59885.json) - **RHSA-2026:48933** · Red Hat · fixed in: Red Hat Quay 3.15 · released 2026-07-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:48933) **pyasn1: python-pyasn1: pyasn1: Denial of Service via crafted ASN.1 OBJECT IDENTIFIER** — rated Important by Red Hat. Released 2026-07-14, updated 2026-09-21. Affected: - Exploit Intelligence - Lightspeed Core - Migration Toolkit for Applications 8 - Migration Toolkit for Containers - Migration Toolkit for Virtualization - OpenShift Lightspeed - OpenShift Service Mesh 3 - Red Hat AI Inference Server - Red Hat Ansible Automation Platform 2 - Red Hat Ceph Storage 7 - Red Hat Ceph Storage 8 - Red Hat Ceph Storage 9 - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat OpenStack Platform 16.2 - Red Hat OpenStack Platform 17.1 - Red Hat OpenStack Platform 18.0 - Red Hat Satellite 6 - Red Hat Trusted Artifact Signer - Service Telemetry Framework 1.5 Fixed: - Red Hat Ansible Automation Platform 2.5 for RHEL 8 - Red Hat Ansible Automation Platform 2.5 for RHEL 9 - Red Hat Ansible Automation Platform 2.6 for RHEL 9 - Red Hat AI Inference Server 3.3 - Red Hat Enterprise Linux AI 3.3 - Red Hat Hardened Images - Red Hat Migration Toolkit for Applications 8.2 - Red Hat OpenShift AI 2.25 - Red Hat OpenShift AI 3.4 - Red Hat Quay 3.10 - Red Hat Quay 3.12 - Red Hat Quay 3.15 - Red Hat Quay 3.16 - Red Hat Quay 3.9 No fix planned: - Red Hat Enterprise Linux 6 - Migration Toolkit for Virtualization - Red Hat AI Inference Server - Exploit Intelligence - Lightspeed Core - Migration Toolkit for Containers - OpenShift Service Mesh 3 - Red Hat Ansible Automation Platform 2 - Red Hat Ceph Storage 7 - Red Hat Ceph Storage 8 - Red Hat Ceph Storage 9 - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat OpenStack Platform 16.2 - Red Hat OpenStack Platform 17.1 - Red Hat OpenStack Platform 18.0 - Red Hat Satellite 6 - Red Hat Trusted Artifact Signer - Migration Toolkit for Applications 8 - OpenShift Lightspeed - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Service Telemetry Framework 1.5 Not affected: - Red Hat Ansible Automation Platform 2.6 for RHEL 10 - Red Hat Ansible Automation Platform 2.5 for RHEL 8 - Red Hat Ansible Automation Platform 2.5 for RHEL 9 - Red Hat Ansible Automation Platform 2.6 for RHEL 9 - Red Hat Enterprise Linux AI 3.3 - Red Hat Migration Toolkit for Applications 8.2 - Red Hat OpenShift AI 2.25 - Red Hat OpenShift AI 3.4 - Red Hat Quay 3.10 - Red Hat Quay 3.12 ## Remediation For details on how to apply this update, refer to Ansible Automation Platform documentation. https://access.redhat.com/errata/RHSA-2026:50319 For details on how to apply this update, refer to Ansible Automation Platform documentation. https://access.redhat.com/errata/RHSA-2026:50336 For more information visit https://access.redhat.com/errata/RHSA-2026:59518 https://access.redhat.com/errata/RHSA-2026:59518 Workarounds / mitigations: - Update to pyasn1 version 0.6.4 or later when available for your product stream. The impact is limited to availability (denial of service) — an attacker cannot access or modify data. Applications that do not process untrusted ASN.1 input are at reduced risk. ## Package advisory (CVE-2026-59885) Affected packages: - `pyasn1 < 0.6.4` Patched in: - `pyasn1 0.6.4` Source: https://osv.dev/vulnerability/GHSA-8ppf-4f7h-5ppj