UBUNTU-CVE-2026-119194

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    UBUNTU-CVE-2026-119194

    Published: 29 Oct 2026Last Modified: 10 Nov 2026
    Upstream:
    CVE-2026-119194

    Summary:

    Details: pyasn1 is a generic ASN.1 library for Python. From 0.3.3 until 0.6.5, schemaless container decoding stores every decoded component's TagSet in a growing set even though only one-versus-multiple tag types must be distinguished. Attacker-controlled BER, CER, or DER input contains many distinct long tag IDs whose TagSet hashes collide. Each later set insertion compares against an increasing number of earlier colliding tags in ConstructedPayloadDecoderBase._decodeComponentsSchemaless, producing quadratic CPU work while decoded values and order remain valid. Repeated inputs can exhaust decoder CPU and reduce service availability. This issue is fixed in version 0.6.5.

    References: https://ubuntu.com/security/CVE-2026-119194, https://www.cve.org/CVERecord?id=CVE-2026-119194, https://github.com/pyasn1/pyasn1/commit/a36e3a3d067148d26197a6b7221fd0e2cde9cc86, https://github.com/pyasn1/pyasn1/pull/132, https://github.com/pyasn1/pyasn1/releases/tag/v0.6.5, https://github.com/pyasn1/pyasn1/security/advisories/GHSA-fm9c-5rcf-2q5p

    Affected packages

    Package

    Name: pyasn1

    Purl: pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.1.4-0ubuntu1
    0.1.7-1ubuntu1
    0.1.7-1ubuntu2
    0.1.7-1ubuntu2.1
    0.1.7-1ubuntu2.1+esm1
    0.1.7-1ubuntu2.1+esm2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-119194 | CVE-DB