webhookd: Unrestricted HTTP Header to Shell Variable Injection

{
  "id": "1144dedf95c11acf2daf57b2dcc2b81893660c749089843e464730e067517906",
  "url": "https://osv.dev/vulnerability/CVE-2026-59157",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "webhookd: Unrestricted HTTP Header to Shell Variable Injection",
    "summary": "webhookd is a minimalist webhook server that triggers shell scripts and external processes through HTTP requests. Prior to 1.22.0, webhookd deployments without htpasswd authentication forwarded all incoming HTTP headers through HTTPParamsToShellVars in pkg/api/index.go into the hook script environment without an allowlist. When an upstream reverse proxy did not strip a client-supplied X-WebAuthn-User header and a hook script trusted that variable for identity or privilege, a remote unauthenticated attacker could spoof another user, bypass script security controls, and access or modify resources available to the impersonated identity. This issue is fixed in version 1.22.0.",
    "evidence": "osv:CVE-2026-59157",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-59157",
      "aliases": [
        "CVE-2026-59157",
        "GHSA-v25g-mvwr-f5fp",
        "GO-2026-6451"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ncarlier/webhookd",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5ac66677bf7224191f1dfc51a875b09187d10beb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.22"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5ac66677bf7224191f1dfc51a875b09187d10beb"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5ac66677bf7224191f1dfc51a875b09187d10beb"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.22.0"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.22.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.21.0",
            "v1.20.2",
            "v1.20.1",
            "v1.20.0",
            "v1.19.0",
            "v1.18.0",
            "v1.17.3",
            "v1.17.2",
            "v1.17.1",
            "v1.16.0",
            "v1.15.1",
            "v1.15.0",
            "v1.14.0",
            "v1.13.0",
            "v1.12.0",
            "v1.11.0",
            "v1.10.0",
            "v1.9.0",
            "1.8.0",
            "v1.7.0",
            "v1.6.1",
            "v1.6.0",
            "v1.5.1",
            "v1.5.0",
            "v1.4.0",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59157.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.903612949Z",
      "provider": "osv",
      "references": [
        "https://github.com/ncarlier/webhookd/releases/tag/v1.22.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59157.json",
        "https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-59157",
        "https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb",
        "https://github.com/ncarlier/webhookd/pull/121"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-290",
          "CWE-807"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59157.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-59157",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510934,
  "published_at": "2026-09-15T15:46:35.418+00:00"
}