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act: Unrestricted set-env and add-path command processing enables environment injection

Type: advisorySources: OSV

act is a project which allows for local running of github actions. Prior to version 0.2.86, act unconditionally processes the deprecated ::set-env:: and ::add-path:: workflow commands, which was disabled due to environment injection risks. When a workflow step echoes untrusted data to stdout, an attacker can inject these commands to set arbitrary environment variables or modify the PATH for all subsequent steps in the job. This issue has been patched in version 0.2.86.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-34041
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 02:06 UTC · Revision 1

Source evidence

act: Unrestricted set-env and add-path command processing enables environment injection

core-osv · Original source

Published 31 Mar 2026, 01:43 UTC

act is a project which allows for local running of github actions. Prior to version 0.2.86, act unconditionally processes the deprecated ::set-env:: and ::add-path:: workflow commands, which was disabled due to environment injection risks. When a workflow step echoes untrusted data to stdout, an attacker can inject these commands to set arbitrary environment variables or modify the PATH for all subsequent steps in the job. This issue has been patched in version 0.2.86.

osv:CVE-2026-34041
Complete source record
{
  "id": "fe7b3f80ec7092507cadce16e25b32a59f2c04f0f44370a9797fb9eeca288335",
  "url": "https://osv.dev/vulnerability/CVE-2026-34041",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "act: Unrestricted set-env and add-path command processing enables environment injection",
    "summary": "act is a project which allows for local running of github actions. Prior to version 0.2.86, act unconditionally processes the deprecated ::set-env:: and ::add-path:: workflow commands, which was disabled due to environment injection risks. When a workflow step echoes untrusted data to stdout, an attacker can inject these commands to set arbitrary environment variables or modify the PATH for all subsequent steps in the job. This issue has been patched in version 0.2.86.",
    "evidence": "osv:CVE-2026-34041",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-34041",
      "aliases": [
        "CVE-2026-34041",
        "GHSA-xmgr-9pqc-h5vw",
        "GO-2026-4891"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nektos/act",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e71313c826e8636eac974ba709dd60e02eef41bd"
                },
                {
                  "fixed": "0c739c8e39c41aa5a07665f732da9cab6df0097a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nektos:act:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.2.86"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0c739c8e39c41aa5a07665f732da9cab6df0097a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e71313c826e8636eac974ba709dd60e02eef41bd"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.2.86"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.2.85",
            "v0.2.84",
            "v0.2.83",
            "v0.2.82",
            "v0.2.81",
            "v0.2.80",
            "v0.2.79",
            "v0.2.78",
            "v0.2.77",
            "v0.2.76",
            "v0.2.75",
            "v0.2.74",
            "v0.2.73",
            "v0.2.72",
            "v0.2.71",
            "v0.2.70",
            "v0.2.69",
            "v0.2.68",
            "v0.2.67",
            "v0.2.66",
            "v0.2.65",
            "v0.2.64",
            "v0.2.63",
            "v0.2.62",
            "v0.2.61",
            "v0.2.60",
            "v0.2.59",
            "v0.2.58",
            "v0.2.57",
            "v0.2.56",
            "v0.2.55",
            "v0.2.54",
            "v0.2.53",
            "v0.2.52",
            "v0.2.51",
            "v0.2.50",
            "v0.2.49",
            "v0.2.48",
            "v0.2.47",
            "v0.2.46",
            "v0.2.45",
            "v0.2.44",
            "v0.2.43",
            "v0.2.42",
            "v0.2.41",
            "v0.2.40",
            "v0.2.39",
            "v0.2.38",
            "v0.2.37",
            "v0.2.36",
            "v0.2.35",
            "v0.2.34",
            "v0.2.33",
            "v0.2.32",
            "v0.2.31",
            "v0.2.30",
            "v0.2.29",
            "v0.2.28",
            "v0.2.27",
            "v0.2.26",
            "v0.2.25",
            "v0.2.24",
            "v0.2.23",
            "v0.2.22",
            "v0.2.21",
            "v0.2.20",
            "v0.2.19",
            "v0.2.18",
            "v0.2.17",
            "v0.2.16",
            "v0.2.15",
            "v0.2.14",
            "v0.2.13",
            "v0.2.12",
            "v0.2.11",
            "v0.2.10",
            "v0.2.9",
            "v0.2.8",
            "v0.2.7",
            "v0.2.6",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34041.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.824262587Z",
      "provider": "osv",
      "references": [
        "https://github.com/nektos/act/releases/tag/v0.2.86",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34041.json",
        "https://github.com/nektos/act/security/advisories/GHSA-xmgr-9pqc-h5vw",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34041",
        "https://github.com/nektos/act/commit/0c739c8e39c41aa5a07665f732da9cab6df0097a"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-74"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34041.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34041",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521623,
  "published_at": "2026-03-31T01:43:25.074+00:00"
}