Medium

uutils coreutils printenv Security Inspection Bypass via UTF-8 Enforcement

Type: advisorySources: OSV

The printenv utility in uutils coreutils fails to display environment variables containing invalid UTF-8 byte sequences. While POSIX permits arbitrary bytes in environment strings, the uutils implementation silently skips these entries rather than printing the raw bytes. This vulnerability allows malicious environment variables (e.g., adversarial LD_PRELOAD values) to evade inspection by administrators or security auditing tools, potentially allowing library injection or other environment-based attacks to go undetected.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-35366
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 16:11 UTC · Revision 1

Source evidence

uutils coreutils printenv Security Inspection Bypass via UTF-8 Enforcement

core-osv · Original source

Published 22 Apr 2026, 16:08 UTC

osv:CVE-2026-35366

Complete source record

{
  "id": "50ef70af1e76b9ab0b754f4ce61753df1540864125cfad9d34a76d9a1742a509",
  "url": "https://osv.dev/vulnerability/CVE-2026-35366",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "uutils coreutils printenv Security Inspection Bypass via UTF-8 Enforcement",
    "summary": "The printenv utility in uutils coreutils fails to display environment variables containing invalid UTF-8 byte sequences. While POSIX permits arbitrary bytes in environment strings, the uutils implementation silently skips these entries rather than printing the raw bytes. This vulnerability allows malicious environment variables (e.g., adversarial LD_PRELOAD values) to evade inspection by administrators or security auditing tools, potentially allowing library injection or other environment-based attacks to go undetected.",
    "evidence": "osv:CVE-2026-35366",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-35366",
      "aliases": [
        "CVE-2026-35366",
        "GHSA-p7h3-7q52-72w8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/uutils/coreutils",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2319a99057d11b0c9744c885df84806eea019166"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "0.6.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2319a99057d11b0c9744c885df84806eea019166"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.6.0"
                  },
                  {
                    "cpe": "cpe:2.3:a:uutils:coreutils:*:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "latest-commit",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.2",
            "0.2.0",
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            "0.0.30-delete",
            "0.0.30",
            "0.0.29",
            "0.0.28",
            "0.0.27",
            "0.0.26",
            "0.0.25",
            "0.0.24",
            "0.0.23",
            "0.0.22",
            "0.0.21",
            "0.0.20",
            "0.0.19",
            "0.0.18",
            "0.0.17",
            "0.0.16",
            "0.0.15",
            "0.0.14",
            "0.0.13",
            "0.0.12",
            "0.0.9",
            "0.0.8",
            "0.0.7",
            "0.0.6",
            "0.0.5",
            "0.0.3",
            "0.0.2",
            "0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35366.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.322437180Z",
      "provider": "osv",
      "references": [
        "https://github.com/uutils",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35366.json",
        "https://github.com/uutils/coreutils/releases/tag/0.6.0",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35366",
        "https://github.com/uutils/coreutils/issues/9701",
        "https://github.com/uutils/coreutils/pull/9728",
        "https://github.com/uutils/coreutils"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-754"
        ],
        "cna_assigner": "canonical",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35366.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35366",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497178,
  "published_at": "2026-04-22T16:08:43.746+00:00"
}