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Calico Typha hangs during unclean TLS handshake

Type: advisorySources: OSV

In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-41378
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 01:04 UTC · Revision 1

Source evidence

Calico Typha hangs during unclean TLS handshake

core-osv · Original source

Published 6 Nov 2023, 15:00 UTC

In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.

osv:CVE-2023-41378
Complete source record
{
  "id": "1c8a68669ecb6c5899307fb4e55f09738b20988c5207e3f6047a247a627b68a5",
  "url": "https://osv.dev/vulnerability/CVE-2023-41378",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Calico Typha hangs during unclean TLS handshake",
    "summary": "In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.",
    "evidence": "osv:CVE-2023-41378",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-41378",
      "aliases": [
        "CVE-2023-41378",
        "GHSA-5r5h-q934-cccp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/projectcalico/calico",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0d154c5ee13042898b9d7a7cc34881b336c49e04"
                },
                {
                  "fixed": "978a0e4bcde894d017f230c4d82c464d702c43f4"
                },
                {
                  "introduced": "3c3aa6d8c30d22aee4bb1b2aa3cdefbd99a66857"
                },
                {
                  "fixed": "e273ebcc2f988e79fa8be02dab711332cd5974d7"
                },
                {
                  "introduced": "2e0037d80aa84c7caedcb7ddd5e90a3003a2d9d6"
                },
                {
                  "fixed": "663591f0e46ce8d242a7e5a19f14a139143a2f39"
                },
                {
                  "introduced": "1bd249b2684d25429bd2e00c964d1daa994ae901"
                },
                {
                  "fixed": "bdb7878af3d67c690ef83ea3d008ef0498568f43"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tigera:calico_enterprise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.15.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:o:tigera:calico_os:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.25.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:tigera:calico_enterprise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.16.0"
                      },
                      {
                        "fixed": "3.16.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:tigera:calico_enterprise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.17.0"
                      },
                      {
                        "fixed": "3.17.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:o:tigera:calico_os:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.26.0"
                      },
                      {
                        "fixed": "3.26.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.26.2",
            "v3.26.1",
            "v3.26.0",
            "v3.25.1",
            "v3.25.0-0.dev",
            "v3.24.0-0.dev",
            "v3.18.5-calico",
            "v3.18.5",
            "v3.17.5-calico",
            "v3.17.5",
            "v3.18.1-calico",
            "v3.18.1",
            "v3.17.1-typha",
            "v3.17.0-typha",
            "v3.16.5-calico",
            "v3.16.5",
            "v3.16.2-typha",
            "v3.16.1-typha",
            "v3.15.2-typha",
            "v3.16.0-typha",
            "v3.16.0-calico",
            "v3.16.0",
            "v3.15.1-typha",
            "v3.15.0-typha",
            "v3.15.0-0.dev-typha",
            "v3.12.0-typha",
            "v3.14.0-0.dev-typha",
            "v3.13.5-typha",
            "v3.13.4-typha",
            "v3.13.3-typha",
            "v3.13.2-typha",
            "v3.13.1-typha",
            "v3.13.0-typha",
            "v3.13.0-0.dev-typha",
            "v3.11.1-typha",
            "v3.11.0-typha",
            "v3.11.1-calico",
            "v3.11.1",
            "v3.9.4-calico",
            "v3.9.4",
            "v3.8.5-calico",
            "v3.8.5",
            "v3.10.2-calico",
            "v3.10.2",
            "v3.10.0-calico",
            "v3.10.0",
            "v3.11.0-0.dev-typha",
            "v3.9.0-calico",
            "v3.9.0",
            "v3.10.0-0.dev-typha",
            "v3.3.7-calico",
            "v3.3.7",
            "v3.2.8-calico",
            "v3.2.8",
            "v3.1.7-calico",
            "v3.1.7",
            "v3.0.12-calico",
            "v3.0.12",
            "v3.9.0-0.dev-typha",
            "v3.6.1-typha",
            "v3.6.0-typha",
            "v3.8.0-0.dev-typha",
            "v3.7.0-0.dev-typha",
            "v3.4.1-typha",
            "v3.4.0-typha",
            "v3.5.1-typha",
            "v3.5.0-typha",
            "v3.5.0-beta.0-typha",
            "v3.6.0-0.dev-typha",
            "v3.5.0-0.dev-typha",
            "v3.3.0-typha",
            "v3.4.0-0.dev-typha",
            "v3.2.1-typha",
            "v3.2.0-typha",
            "v3.2.0-calico",
            "v3.2.0",
            "v3.0.1-calico",
            "v3.0.1",
            "v0.6.0-typha",
            "v3.0.0-calico",
            "v3.0.0",
            "v0.6.0-beta1-typha",
            "v2.6.2-calico",
            "v2.6.2",
            "v0.6.0-alpha1-typha",
            "v0.5.1-typha",
            "v0.6.0-alpha1-rc1-typha",
            "v3.0.0-alpha1-rc1-calico",
            "v3.0.0-alpha1-rc1",
            "v2.6.0-calico",
            "v2.6.0",
            "v2.6.0-rc2-calico",
            "v2.6.0-rc2",
            "v2.6.0-rc1-calico",
            "v2.6.0-rc1",
            "v0.5.0-typha",
            "v0.4.0-typha",
            "v2.5.0-calico",
            "v2.5.0",
            "v2.5.0-rc2-calico",
            "v2.5.0-rc2",
            "v0.3.1-typha",
            "v0.3.0-typha",
            "v0.2.3-typha",
            "v0.2.3-pre1-typha",
            "v0.2.2-typha",
            "v0.2.1-typha",
            "v0.1.7-typha",
            "v0.1.5-typha",
            "v0.1.4-typha",
            "v0.1.3-typha",
            "v0.1.2-typha",
            "v0.1.1-typha",
            "v0.1.0-typha"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-41378.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.185713710Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41378.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-41378",
        "https://www.tigera.io/security-bulletins-tta-2023-001/",
        "https://github.com/projectcalico/calico/pull/7908",
        "https://github.com/projectcalico/calico/pull/7993"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400",
          "CWE-703"
        ],
        "cna_assigner": "Tigera",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41378.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-41378",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508896,
  "published_at": "2023-11-06T15:00:53.249+00:00"
}