Описание
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.
An unbounded recursion flaw has been discovered in the pypi pyasn1 library. This uncontrolled recursion occurs when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing 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.
Отчет
This vulnerability is rated as having an Important impact by Red Hat because a remote, unauthenticated attacker can crash services or exhaust system resources by supplying malformed input, without needing elevated privileges. While pyasn1 is widely bundled across Red Hat container images and automation tools, the risk is concentrated in services that directly ingest untrusted network data. Applications and utilities operating strictly on authenticated or locally generated inputs face significantly reduced exposure.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Migration Toolkit for Containers | rhmtc/openshift-migration-rhel8-operator | Will not fix | ||
| Migration Toolkit for Virtualization | migration-toolkit-virtualization/mtv-rhel9-operator | Will not fix | ||
| Migration Toolkit for Virtualization | mtv-candidate/mtv-rhel9-operator | Will not fix | ||
| OpenShift Lightspeed | openshift-lightspeed/lightspeed-service-api-rhel9 | Will not fix | ||
| OpenShift Lightspeed | openshift-lightspeed/lightspeed-to-dataverse-exporter-rhel9 | Affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh/kiali-rhel9-operator | Not affected | ||
| Red Hat AI Inference Server | rhaiis/vllm-tpu-rhel9 | Affected | ||
| Red Hat Ansible Automation Platform 2 | ansible-automation-platform-24/ee-minimal-rhel8 | Will not fix | ||
| Red Hat Ansible Automation Platform 2 | ansible-automation-platform-24/ee-minimal-rhel9 | Will not fix | ||
| Red Hat Ansible Automation Platform 2 | ansible-automation-platform-24/ee-supported-rhel8 | Will not fix |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
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.
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.
pyasn1 Vulnerable to Denial of Service via Unbounded Recursion
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pya ...
EPSS
7.5 High
CVSS3