Vulnerability-Lookup

GHSA-P6F4-6QXG-8XQV

Vulnerability from github – Published: 2026-03-29 03:30 – Updated: 2026-03-31 21:31

Details

GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.

GRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.

read_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()

$arg .= '$VAR1'; my $val = eval "no strict; $arg"; # line 40-41

$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:

$VAR1 = do { system("..."); };

This executes on the client silently on every RPC call, as the return values remain correct.

This functionality is by design but the trust requirement for the remote host is not documented in the distribution.

Severity ?

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-4851"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-95"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-29T01:15:56Z",
    "severity": "CRITICAL"
  },
  "details": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.\n\nGRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.\n\nread_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()\n\n  $arg .= \u0027$VAR1\u0027;\n  my $val = eval \"no strict; $arg\"; # line 40-41\n\n$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:\n\n  $VAR1 = do { system(\"...\"); };\n\nThis executes on the client silently on every RPC call, as the return values remain correct.\n\nThis functionality is by design but the trust requirement for the remote host is not documented in the distribution.",
  "id": "GHSA-p6f4-6qxg-8xqv",
  "modified": "2026-03-31T21:31:18Z",
  "published": "2026-03-29T03:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4851"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2026/03/26/6"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/26/6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-4851 (GCVE-0-2026-4851)

Vulnerability from cvelistv5 – Published: 2026-03-29 00:22 – Updated: 2026-04-01 14:17

Title

GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization

Summary

GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization. GRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol. read_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval() $arg .= '$VAR1'; my $val = eval "no strict; $arg"; # line 40-41 $arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response: $VAR1 = do { system("..."); }; This executes on the client silently on every RPC call, as the return values remain correct. This functionality is by design but the trust requirement for the remote host is not documented in the distribution.

Severity ?

9.8 (Critical)


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

CWE

CWE-502 - Deserialization of Untrusted Data
CWE-95 - Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Assigner

CPANSec

References

URL

Tags

https://www.openwall.com/lists/oss-security/2026/…

third-party-advisory

Impacted products

	Vendor	Product	Version
	CASIANO	GRID::Machine	Affected: 0 , ≤ 0.127 (custom)

Credits

Pied Crow crow@cpan.org

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-29T00:23:56.336Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/26/6"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-4851",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-01T14:17:04.307893Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-01T14:17:48.164Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "GRID-Machine",
          "product": "GRID::Machine",
          "programFiles": [
            "lib/GRID/Machine/Message.pm"
          ],
          "programRoutines": [
            {
              "name": "GRID::Machine::read_operation()"
            }
          ],
          "vendor": "CASIANO",
          "versions": [
            {
              "lessThanOrEqual": "0.127",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Pied Crow crow@cpan.org"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.\n\nGRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.\n\nread_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()\n\n  $arg .= \u0027$VAR1\u0027;\n  my $val = eval \"no strict; $arg\"; # line 40-41\n\n$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:\n\n  $VAR1 = do { system(\"...\"); };\n\nThis executes on the client silently on every RPC call, as the return values remain correct.\n\nThis functionality is by design but the trust requirement for the remote host is not documented in the distribution."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-586",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-586 Object Injection"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502 Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-95",
              "description": "CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code (\u0027Eval Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-29T00:22:22.578Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.openwall.com/lists/oss-security/2026/03/26/6"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-03-24T00:00:00.000Z",
          "value": "Vulnerability reported to module author and CPANSec"
        },
        {
          "lang": "en",
          "time": "2026-03-25T00:00:00.000Z",
          "value": "CVE assigned by CPANSec"
        },
        {
          "lang": "en",
          "time": "2026-03-26T00:00:00.000Z",
          "value": "Author confirmed module is unmaintained, no fix available"
        },
        {
          "lang": "en",
          "time": "2026-03-26T00:00:00.000Z",
          "value": "Disclosed on oss-security mailing list"
        }
      ],
      "title": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization",
      "workarounds": [
        {
          "lang": "en",
          "value": "There is no fix available. If used, only connect to trusted remote hosts."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-4851",
    "datePublished": "2026-03-29T00:22:22.578Z",
    "dateReserved": "2026-03-25T14:56:47.454Z",
    "dateUpdated": "2026-04-01T14:17:48.164Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-P6F4-6QXG-8XQV

CVE-2026-4851 (GCVE-0-2026-4851)

Tags

Sightings

Nomenclature