Advisory Database
  • Advisories
  • Dependency Scanning
  1. maven
  2. ›
  3. io.grpc/grpc-protobuf
  4. ›
  5. CVE-2023-32731

CVE-2023-32731: Connection confusion in gRPC

July 5, 2023 (updated August 13, 2025)

When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration.

References

  • github.com/advisories/GHSA-cfgp-2977-2fmm
  • github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10
  • github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946
  • github.com/grpc/grpc/issues/33463
  • github.com/grpc/grpc/pull/32309
  • github.com/grpc/grpc/pull/33005
  • github.com/grpc/grpc/releases/tag/v1.53.1
  • github.com/grpc/grpc/releases/tag/v1.54.2
  • github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32731.yml
  • nvd.nist.gov/vuln/detail/CVE-2023-32731

Code Behaviors & Features

Detect and mitigate CVE-2023-32731 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions starting from 1.53.0 before 1.53.1, all versions starting from 1.54.0 before 1.54.2

Fixed versions

  • 1.53.1
  • 1.54.2

Solution

Upgrade to versions 1.53.1, 1.54.2 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Learn more about CVSS

Weakness

  • CWE-440: Expected Behavior Violation

Source file

maven/io.grpc/grpc-protobuf/CVE-2023-32731.yml

Spotted a mistake? Edit the file on GitLab.

  • Site Repo
  • About GitLab
  • Terms
  • Privacy Statement
  • Contact

Page generated Fri, 29 Aug 2025 00:20:09 +0000.