CVE-2026-119194

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    CVE-2026-119194

    Published: 29 Oct 2026Last Modified: 9 Nov 2026

    Summary: pyasn1: Quadratic CPU use in schemaless BER/CER/DER container decoding

    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://github.com/pyasn1/pyasn1/releases/tag/v0.6.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119194.json, https://github.com/pyasn1/pyasn1/security/advisories/GHSA-fm9c-5rcf-2q5p, https://nvd.nist.gov/vuln/detail/CVE-2026-119194, https://github.com/pyasn1/pyasn1/commit/a36e3a3d067148d26197a6b7221fd0e2cde9cc86, https://github.com/pyasn1/pyasn1/pull/132

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3938e520f13feee93dccabf9824f0da122cc54ed
    Fixed -5d1673657b729fb580467e2cf4875856bbca5e59

    Affected versions

    v0.6.4
    v0.6.3
    v0.6.2
    v0.6.1
    v0.6.0

    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
    CVE-2026-119194 | CVE-DB