PYSEC-2026-1426

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:24
VLAI
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.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Impacted products
Name purl
grpcio pkg:pypi/grpcio
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "grpcio",
        "purl": "pkg:pypi/grpcio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.53.0"
            },
            {
              "fixed": "1.53.1"
            },
            {
              "introduced": "1.54.0"
            },
            {
              "fixed": "1.54.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.53.0",
        "1.54.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-32732",
    "GHSA-9hxf-ppjv-w6rq"
  ],
  "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\u00a0https://github.com/grpc/grpc/pull/32309.",
  "id": "PYSEC-2026-1426",
  "modified": "2026-07-07T17:24:16.132736Z",
  "published": "2026-07-07T11:45:20.840192Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-32732"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc/pull/32309"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc/releases/tag/v1.53.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc/releases/tag/v1.54.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/grpcio"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-9hxf-ppjv-w6rq"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "gRPC connection termination issue"
}



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Nomenclature

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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