RHSA-2026:3359

Vulnerability from csaf_opensuse - Published: 2026-02-25 14:42 - Updated: 2026-10-08 22:33
Summary
Red Hat Security Advisory: python-pyasn1 security update
Severity
Important
Notes
Topic: An update for python-pyasn1 is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID (CVE-2026-23490) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-23490

A flaw was found in pyasn1, a generic ASN.1 library for Python. A remote attacker could exploit this vulnerability by sending a specially crafted RELATIVE-OID with excessive continuation octets. This input validation vulnerability leads to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.7.0.Z.MAIN:python-pyasn1-0:0.4.8-7.el9_7.src —
Vendor Fix fix
Unresolved product id: AppStream-9.7.0.Z.MAIN:python3-pyasn1-0:0.4.8-7.el9_7.noarch —
Vendor Fix fix
Unresolved product id: AppStream-9.7.0.Z.MAIN:python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch —
Vendor Fix fix
Threats
Impact Important
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for python-pyasn1 is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.\n\nSecurity Fix(es):\n\n* pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID (CVE-2026-23490)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:3359",
        "url": "https://access.redhat.com/errata/RHSA-2026:3359"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/#important",
        "url": "https://access.redhat.com/security/updates/classification/#important"
      },
      {
        "category": "external",
        "summary": "2430472",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2430472"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_3359.json"
      }
    ],
    "title": "Red Hat Security Advisory: python-pyasn1 security update",
    "tracking": {
      "current_release_date": "2026-10-08T22:33:49+00:00",
      "generator": {
        "date": "2026-10-08T22:33:49+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.4.2"
        }
      },
      "id": "RHSA-2026:3359",
      "initial_release_date": "2026-02-25T14:42:21+00:00",
      "revision_history": [
        {
          "date": "2026-02-25T14:42:21+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-02-25T14:42:21+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-10-08T22:33:49+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Enterprise Linux AppStream (v. 9)",
                "product": {
                  "name": "Red Hat Enterprise Linux AppStream (v. 9)",
                  "product_id": "AppStream-9.7.0.Z.MAIN",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:enterprise_linux:9::appstream"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Enterprise Linux"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python-pyasn1-0:0.4.8-7.el9_7.src",
                "product": {
                  "name": "python-pyasn1-0:0.4.8-7.el9_7.src",
                  "product_id": "python-pyasn1-0:0.4.8-7.el9_7.src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/python-pyasn1@0.4.8-7.el9_7?arch=src"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python3-pyasn1-0:0.4.8-7.el9_7.noarch",
                "product": {
                  "name": "python3-pyasn1-0:0.4.8-7.el9_7.noarch",
                  "product_id": "python3-pyasn1-0:0.4.8-7.el9_7.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/python3-pyasn1@0.4.8-7.el9_7?arch=noarch"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch",
                "product": {
                  "name": "python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch",
                  "product_id": "python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/python3-pyasn1-modules@0.4.8-7.el9_7?arch=noarch"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python-pyasn1-0:0.4.8-7.el9_7.src as a component of Red Hat Enterprise Linux AppStream (v. 9)",
          "product_id": "AppStream-9.7.0.Z.MAIN:python-pyasn1-0:0.4.8-7.el9_7.src"
        },
        "product_reference": "python-pyasn1-0:0.4.8-7.el9_7.src",
        "relates_to_product_reference": "AppStream-9.7.0.Z.MAIN"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python3-pyasn1-0:0.4.8-7.el9_7.noarch as a component of Red Hat Enterprise Linux AppStream (v. 9)",
          "product_id": "AppStream-9.7.0.Z.MAIN:python3-pyasn1-0:0.4.8-7.el9_7.noarch"
        },
        "product_reference": "python3-pyasn1-0:0.4.8-7.el9_7.noarch",
        "relates_to_product_reference": "AppStream-9.7.0.Z.MAIN"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch as a component of Red Hat Enterprise Linux AppStream (v. 9)",
          "product_id": "AppStream-9.7.0.Z.MAIN:python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch"
        },
        "product_reference": "python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch",
        "relates_to_product_reference": "AppStream-9.7.0.Z.MAIN"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-23490",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-01-16T20:03:33.790513+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2430472"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in pyasn1, a generic ASN.1 library for Python. A remote attacker could exploit this vulnerability by sending a specially crafted RELATIVE-OID with excessive continuation octets. This input validation vulnerability leads to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-9.7.0.Z.MAIN:python-pyasn1-0:0.4.8-7.el9_7.src",
          "AppStream-9.7.0.Z.MAIN:python3-pyasn1-0:0.4.8-7.el9_7.noarch",
          "AppStream-9.7.0.Z.MAIN:python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-23490"
        },
        {
          "category": "external",
          "summary": "RHBZ#2430472",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2430472"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-23490",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-23490"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23490",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23490"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970",
          "url": "https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2",
          "url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq",
          "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq"
        }
      ],
      "release_date": "2026-01-16T19:03:36.442000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-02-25T14:42:21+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-9.7.0.Z.MAIN:python-pyasn1-0:0.4.8-7.el9_7.src",
            "AppStream-9.7.0.Z.MAIN:python3-pyasn1-0:0.4.8-7.el9_7.noarch",
            "AppStream-9.7.0.Z.MAIN:python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:3359"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-9.7.0.Z.MAIN:python-pyasn1-0:0.4.8-7.el9_7.src",
            "AppStream-9.7.0.Z.MAIN:python3-pyasn1-0:0.4.8-7.el9_7.noarch",
            "AppStream-9.7.0.Z.MAIN:python3-pyasn1-modules-0:0.4.8-7.el9_7.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.