High severityOSV Advisory· Published Jan 16, 2026· Updated Feb 1, 2026
pyasn1 has a DoS vulnerability in decoder
CVE-2026-23490
Description
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pyasn1PyPI | >= 0.6.1, < 0.6.2 | 0.6.2 |
Affected products
142- osv-coords141 versionspkg:apk/chainguard/airflow-2pkg:apk/chainguard/airflow-3pkg:apk/chainguard/ansible-operatorpkg:apk/chainguard/ansible-operator-fipspkg:apk/chainguard/apache-beam-python-3.11-sdkpkg:apk/chainguard/authentikpkg:apk/chainguard/authentik-fipspkg:apk/chainguard/barman-cloudnative-pgpkg:apk/chainguard/dask-kubernetespkg:apk/chainguard/gitlab-toolbox-ce-18.6pkg:apk/chainguard/gitlab-toolbox-ce-18.7pkg:apk/chainguard/gitlab-toolbox-ce-fips-18.6pkg:apk/chainguard/gitlab-toolbox-ce-fips-18.7pkg:apk/chainguard/k8s-sidecarpkg:apk/chainguard/katib-earlystoppingpkg:apk/chainguard/kserve-storage-controllerpkg:apk/chainguard/kubeflow-jupyter-web-apppkg:apk/chainguard/kubeflow-pipelines-apiserverpkg:apk/chainguard/kubeflow-pipelines-visualization-serverpkg:apk/chainguard/kubeflow-volumes-web-apppkg:apk/chainguard/label-studiopkg:apk/chainguard/litellmpkg:apk/chainguard/localstackpkg:apk/chainguard/metaflow-servicepkg:apk/chainguard/mlflowpkg:apk/chainguard/mlflow-iamguarded-compatpkg:apk/chainguard/open-webuipkg:apk/chainguard/pgadmin4pkg:apk/chainguard/py3.10-duplicitypkg:apk/chainguard/py3.11-duplicitypkg:apk/chainguard/py3.12-duplicitypkg:apk/chainguard/py3.13-duplicitypkg:apk/chainguard/py3-cassandra-medusapkg:apk/chainguard/request-1276pkg:apk/chainguard/spamcheckpkg:apk/chainguard/superset-5.0pkg:apk/wolfi/airflow-3pkg:apk/wolfi/ansible-operatorpkg:apk/wolfi/dask-kubernetespkg:apk/wolfi/k8s-sidecarpkg:apk/wolfi/katib-earlystoppingpkg:apk/wolfi/kserve-storage-controllerpkg:apk/wolfi/kubeflow-jupyter-web-apppkg:apk/wolfi/kubeflow-pipelines-apiserverpkg:apk/wolfi/kubeflow-pipelines-visualization-serverpkg:apk/wolfi/kubeflow-volumes-web-apppkg:apk/wolfi/mlflowpkg:apk/wolfi/mlflow-iamguarded-compatpkg:apk/wolfi/open-webuipkg:apk/wolfi/py3-cassandra-medusapkg:apk/wolfi/superset-5.0pkg:pypi/pyasn1pkg:rpm/almalinux/fence-agents-aliyunpkg:rpm/almalinux/fence-agents-allpkg:rpm/almalinux/fence-agents-amt-wspkg:rpm/almalinux/fence-agents-apcpkg:rpm/almalinux/fence-agents-apc-snmppkg:rpm/almalinux/fence-agents-awspkg:rpm/almalinux/fence-agents-azure-armpkg:rpm/almalinux/fence-agents-bladecenterpkg:rpm/almalinux/fence-agents-brocadepkg:rpm/almalinux/fence-agents-cisco-mdspkg:rpm/almalinux/fence-agents-cisco-ucspkg:rpm/almalinux/fence-agents-commonpkg:rpm/almalinux/fence-agents-computepkg:rpm/almalinux/fence-agents-drac5pkg:rpm/almalinux/fence-agents-eaton-snmppkg:rpm/almalinux/fence-agents-emersonpkg:rpm/almalinux/fence-agents-epspkg:rpm/almalinux/fence-agents-gcepkg:rpm/almalinux/fence-agents-heuristics-pingpkg:rpm/almalinux/fence-agents-hpbladepkg:rpm/almalinux/fence-agents-ibmbladepkg:rpm/almalinux/fence-agents-ibm-powervspkg:rpm/almalinux/fence-agents-ibm-vpcpkg:rpm/almalinux/fence-agents-ifmibpkg:rpm/almalinux/fence-agents-ilo2pkg:rpm/almalinux/fence-agents-ilo-moonshotpkg:rpm/almalinux/fence-agents-ilo-mppkg:rpm/almalinux/fence-agents-ilo-sshpkg:rpm/almalinux/fence-agents-intelmodularpkg:rpm/almalinux/fence-agents-ipdupkg:rpm/almalinux/fence-agents-ipmilanpkg:rpm/almalinux/fence-agents-kdumppkg:rpm/almalinux/fence-agents-kubevirtpkg:rpm/almalinux/fence-agents-lparpkg:rpm/almalinux/fence-agents-mpathpkg:rpm/almalinux/fence-agents-nutanix-ahvpkg:rpm/almalinux/fence-agents-openstackpkg:rpm/almalinux/fence-agents-redfishpkg:rpm/almalinux/fence-agents-rhevmpkg:rpm/almalinux/fence-agents-rsapkg:rpm/almalinux/fence-agents-rsbpkg:rpm/almalinux/fence-agents-sbdpkg:rpm/almalinux/fence-agents-scsipkg:rpm/almalinux/fence-agents-virshpkg:rpm/almalinux/fence-agents-vmware-restpkg:rpm/almalinux/fence-agents-vmware-soappkg:rpm/almalinux/fence-agents-wtipkg:rpm/almalinux/fence-agents-zvmpkg:rpm/almalinux/fence-virtpkg:rpm/almalinux/fence-virtdpkg:rpm/almalinux/fence-virtd-cpgpkg:rpm/almalinux/fence-virtd-libvirtpkg:rpm/almalinux/fence-virtd-multicastpkg:rpm/almalinux/fence-virtd-serialpkg:rpm/almalinux/fence-virtd-tcppkg:rpm/almalinux/ha-cloud-supportpkg:rpm/almalinux/python3-pyasn1pkg:rpm/almalinux/python3-pyasn1-modulespkg:rpm/almalinux/resource-agentspkg:rpm/almalinux/resource-agents-aliyunpkg:rpm/almalinux/resource-agents-gcppkg:rpm/almalinux/resource-agents-pafpkg:rpm/opensuse/python-pyasn1&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python-pyasn1&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python-pyasn1&distro=openSUSE%20Tumbleweedpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Micro%205.2pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP4pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/python-pyasn1&distro=SUSE%20Linux%20Micro%206.2
< 2.11.0-r24+ 140 more
- (no CPE)range: < 2.11.0-r24
- (no CPE)range: < 3.1.6-r2
- (no CPE)range: < 1.42.0-r6
- (no CPE)range: < 1.42.0-r4
- (no CPE)range: < 2.71.0-r0
- (no CPE)range: < 2025.10.3-r5
- (no CPE)range: < 2025.10.3-r2
- (no CPE)range: < 3.17.0-r1
- (no CPE)range: < 2025.7.0-r6
- (no CPE)range: < 18.6.4-r0
- (no CPE)range: < 18.7.2-r0
- (no CPE)range: < 18.6.4-r0
- (no CPE)range: < 18.7.2-r0
- (no CPE)range: < 2.4.0-r0
- (no CPE)range: < 0.19.0-r4
- (no CPE)range: < 0.16.0-r9
- (no CPE)range: < 1.10.0-r10
- (no CPE)range: < 2.15.0-r9
- (no CPE)range: < 2.15.0-r4
- (no CPE)range: < 1.10.0-r9
- (no CPE)range: < 1.22.0-r2
- (no CPE)range: < 1.80.15.0-r1
- (no CPE)range: < 4.12.0-r4
- (no CPE)range: < 2.5.0-r3
- (no CPE)range: < 3.8.1-r3
- (no CPE)range: < 3.8.1-r3
- (no CPE)range: < 0.7.2-r1
- (no CPE)range: < 9.11-r2
- (no CPE)range: < 3.0.7-r2
- (no CPE)range: < 3.0.7-r2
- (no CPE)range: < 3.0.7-r2
- (no CPE)range: < 3.0.7-r2
- (no CPE)range: < 0.27.0-r2
- (no CPE)range: < 0.27.0-r3
- (no CPE)range: < 3.5.3-r6
- (no CPE)range: < 5.0.0-r13
- (no CPE)range: < 3.1.6-r2
- (no CPE)range: < 1.42.0-r6
- (no CPE)range: < 2025.7.0-r6
- (no CPE)range: < 2.4.0-r0
- (no CPE)range: < 0.19.0-r4
- (no CPE)range: < 0.16.0-r9
- (no CPE)range: < 1.10.0-r10
- (no CPE)range: < 2.15.0-r9
- (no CPE)range: < 2.15.0-r4
- (no CPE)range: < 1.10.0-r9
- (no CPE)range: < 3.8.1-r3
- (no CPE)range: < 3.8.1-r3
- (no CPE)range: < 0.7.2-r1
- (no CPE)range: < 0.27.0-r2
- (no CPE)range: < 5.0.0-r13
- (no CPE)range: >= 0.6.1, < 0.6.2
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 4.10.0-98.el9_7.5
- (no CPE)range: < 0.6.2-1.el10_1
- (no CPE)range: < 0.6.2-1.el10_1
- (no CPE)range: < 4.9.0-54.el8_10.28
- (no CPE)range: < 4.9.0-54.el8_10.28
- (no CPE)range: < 4.9.0-54.el8_10.28
- (no CPE)range: < 4.9.0-54.el8_10.28
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.6.1-160000.3.1
- (no CPE)range: < 0.6.2-1.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.4.2-150000.3.13.1
- (no CPE)range: < 0.4.2-150000.3.13.1
- (no CPE)range: < 0.4.2-150000.3.13.1
- (no CPE)range: < 0.4.2-150000.3.13.1
- (no CPE)range: < 0.4.2-150000.3.13.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.1.9-4.11.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.6.1-160000.3.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.5.0-150400.12.10.1
- (no CPE)range: < 0.6.1-160000.3.1
- (no CPE)range: < 0.1.9-4.11.1
- (no CPE)range: < 0.5.0-3.1
- (no CPE)range: < 0.5.0-slfo.1.1_2.1
- (no CPE)range: < 0.6.1-160000.3.1
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-63vm-454h-vhhqghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-23490ghsaADVISORY
- github.com/pyasn1/pyasn1/blob/0f07d7242a78ab4d129b26256d7474f7168cf536/pyasn1/codec/ber/decoder.pyghsaWEB
- github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970ghsax_refsource_MISCWEB
- github.com/pyasn1/pyasn1/commit/be353d755f42ea36539b4f5053c652ddf56979a6ghsaWEB
- github.com/pyasn1/pyasn1/releases/tag/v0.6.2ghsax_refsource_MISCWEB
- github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhqghsax_refsource_CONFIRMWEB
- lists.debian.org/debian-lts-announce/2026/02/msg00002.htmlghsaWEB
News mentions
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