PYSEC-2026-1426

    Dashboard / Vulnerabilities / PYSEC-2026-1426

    PYSEC-2026-1426

    Published: 7 Jul 2026Last Modified: 7 Jul 2026

    Summary: gRPC connection termination issue

    Details: gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in https://github.com/grpc/grpc/pull/32309.

    References: https://nvd.nist.gov/vuln/detail/CVE-2023-32732, https://github.com/grpc/grpc/pull/32309, https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10, https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946, https://github.com/grpc/grpc/releases/tag/v1.53.1, https://github.com/grpc/grpc/releases/tag/v1.54.2, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml, https://lists.fedoraproject.org/archives/list/[email protected]/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY, https://lists.fedoraproject.org/archives/list/[email protected]/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL, https://pypi.org/project/grpcio, https://github.com/advisories/GHSA-9hxf-ppjv-w6rq

    Affected packages

    Package

    Name: grpcio

    Purl: pkg:pypi/grpcio

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 1.53.0
    Fixed -1.53.1

    Affected versions

    1.53.0

    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
    PYSEC-2026-1426 | CVE-DB