Vulnerability-Lookup

CVE-2026-46643 (GCVE-0-2026-46643)

Vulnerability from cvelistv5 – Published: 2026-06-10 19:52 – Updated: 2026-06-11 16:15

Title

Snappy: Binary path is never shell-escaped due to an inverted is_executable check

Summary

Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.7.1, on POSIX, escapeshellarg(‘/usr/bin/wkhtmltopdf’) returns the literal string ‘/usr/bin/wkhtmltopdf’ with the single-quote characters included. is_executable() then looks for a file whose actual name contains those quote characters, which essentially never exists. The safe branch is dead code and $command always falls through to the raw, unescaped value. The rest of the arguments (options, input, output) are escaped correctly, so injection has to land in the binary string itself. That happens whenever the binary path is sourced from configuration that is user-influenced, derived from environment variables that ultimately come from request data, or concatenated with any user-controlled fragment. This issue has been patched in version 1.7.1.

Severity

7.5 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/KnpLabs/snappy/security/adviso…	x_refsource_CONFIRM
https://github.com/KnpLabs/snappy/releases/tag/v1.7.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
KnpLabs	snappy	Affected: < 1.7.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-46643

Vulnerability from fkie_nvd - Published: 2026-06-10 20:17 - Updated: 2026-06-11 17:16

Severity

7.5 (High) - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/KnpLabs/snappy/releases/tag/v1.7.1
	security-advisories@github.com	https://github.com/KnpLabs/snappy/security/advisories/GHSA-vpr4-p6fq-85jc
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/KnpLabs/snappy/security/advisories/GHSA-vpr4-p6fq-85jc

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.7.1, on POSIX, escapeshellarg(\u2018/usr/bin/wkhtmltopdf\u2019) returns the literal string \u2018/usr/bin/wkhtmltopdf\u2019 with the single-quote characters included. is_executable() then looks for a file whose actual name contains those quote characters, which essentially never exists. The safe branch is dead code and $command always falls through to the raw, unescaped value. The rest of the arguments (options, input, output) are escaped correctly, so injection has to land in the binary string itself. That happens whenever the binary path is sourced from configuration that is user-influenced, derived from environment variables that ultimately come from request data, or concatenated with any user-controlled fragment. This issue has been patched in version 1.7.1."
    }
  ],
  "id": "CVE-2026-46643",
  "lastModified": "2026-06-11T17:16:34.370",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
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      "source": "security-advisories@github.com",
      "url": "https://github.com/KnpLabs/snappy/releases/tag/v1.7.1"
    },
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}

GHSA-VPR4-P6FQ-85JC

Vulnerability from github – Published: 2026-05-21 20:22 – Updated: 2026-06-11 13:30

Summary

Snappy: Binary path is never shell-escaped due to an inverted is_executable check

Details

Impact

On POSIX, escapeshellarg(‘/usr/bin/wkhtmltopdf’) returns the literal string ‘/usr/bin/wkhtmltopdf’ with the single-quote characters included. is_executable() then looks for a file whose actual name contains those quote characters, which essentially never exists. The safe branch is dead code and $command always falls through to the raw, unescaped value.

The rest of the arguments (options, input, output) are escaped correctly, so injection has to land in the binary string itself. That happens whenever the binary path is sourced from configuration that is user-influenced, derived from environment variables that ultimately come from request data, or concatenated with any user-controlled fragment.

Proof of concept:

 $pdf = new Knp\Snappy\Pdf(‘wkhtmltopdf; touch /tmp/snappy_rce’);
 $pdf->generate(‘https://example.com’, ‘/tmp/out.pdf’);
 // /tmp/snappy_rce is created.

Impact: command execution as the PHP process when the binary path is attacker-influenced. Even in deployments where the binary is hard-coded, this is a defensive-in-depth regression: downstream packages reasonably assume Snappy shell-escapes the binary because the code looks like it does.

Patches

The version 1.7.1 will resolve this security advisory.

Workarounds

Before calling the constructor, ensure \is_executable($path) is truthy.

// Bad example
$pdf = new Knp\Snappy\Pdf('/path/to/binary');

// Better example
$pathToBinary = '/path/to/binary';

if (!\is_executable($pathToBinary)) {
  throw new \RuntimeException();
}

$pdf = new Knp\Snappy\Pdf('/path/to/binary');

Severity

7.5 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.7.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "KnpLabs/knp-snappy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.7.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46643"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-21T20:22:16Z",
    "nvd_published_at": "2026-06-10T20:17:28Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nOn POSIX, escapeshellarg(\u2018/usr/bin/wkhtmltopdf\u2019) returns the literal string \u2018/usr/bin/wkhtmltopdf\u2019 with the single-quote characters included. is_executable() then looks for a file whose actual name contains those quote characters, which essentially never exists. The safe branch is dead code and $command always falls through to the raw, unescaped value.\n\nThe rest of the arguments (options, input, output) are escaped correctly, so injection has to land in the binary string itself. That happens whenever the binary path is sourced from configuration that is user-influenced, derived from environment variables that ultimately come from request data, or concatenated with any user-controlled fragment.\n\n#### Proof of concept:\n\n```php\n $pdf = new Knp\\Snappy\\Pdf(\u2018wkhtmltopdf; touch /tmp/snappy_rce\u2019);\n $pdf-\u003egenerate(\u2018https://example.com\u2019, \u2018/tmp/out.pdf\u2019);\n // /tmp/snappy_rce is created.\n```\n\n**Impact:** command execution as the PHP process when the binary path is attacker-influenced. Even in deployments where the binary is hard-coded, this is a defensive-in-depth regression: downstream packages reasonably assume Snappy shell-escapes the binary because the code looks like it does.\n\n### Patches\n\nThe version 1.7.1 will resolve this security advisory.\n\n### Workarounds\n\nBefore calling the constructor, ensure `\\is_executable($path)` is truthy.\n\n```php\n// Bad example\n$pdf = new Knp\\Snappy\\Pdf(\u0027/path/to/binary\u0027);\n```\n\n```php\n// Better example\n$pathToBinary = \u0027/path/to/binary\u0027;\n\nif (!\\is_executable($pathToBinary)) {\n  throw new \\RuntimeException();\n}\n\n$pdf = new Knp\\Snappy\\Pdf(\u0027/path/to/binary\u0027);\n```",
  "id": "GHSA-vpr4-p6fq-85jc",
  "modified": "2026-06-11T13:30:23Z",
  "published": "2026-05-21T20:22:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/KnpLabs/snappy/security/advisories/GHSA-vpr4-p6fq-85jc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46643"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/KnpLabs/snappy"
    },
    {
      "type": "WEB",
      "url": "https://github.com/KnpLabs/snappy/releases/tag/v1.7.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Snappy: Binary path is never shell-escaped due to an inverted is_executable check"
}

Sightings

Author	Source	Type	Date	Other

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

CVE-2026-46643 (GCVE-0-2026-46643)

FKIE_CVE-2026-46643

GHSA-VPR4-P6FQ-85JC

Impact

Proof of concept:

Patches

Workarounds

Tags

Sightings

Nomenclature