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    2 vulnerabilities by Skyvern-AI

    CVE-2026-82447 (GCVE-0-2026-82447)

    Vulnerability from nvd – Published: 2026-08-29 12:05 – Updated: 2026-08-29 12:05
    VLAI
    Title
    Skyvern before 1.0.45 Sandbox Escape via TextPromptBlock
    Summary
    Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
    8.8 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    CWE
    • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
    Assigner
    References
    Impacted products
    Vendor Product Version
    Skyvern-AI skyvern Affected: 0.2.1 , < 1.0.45 (semver)
    		Create a notification for this product.
    Date Public
    2026-07-06 00:00
    Credits
    hayato1121
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/skyvern",
          "product": "skyvern",
          "vendor": "Skyvern-AI",
          "versions": [
            {
              "lessThan": "1.0.45",
              "status": "affected",
              "version": "0.2.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "hayato1121"
        }
      ],
      "datePublic": "2026-07-06T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1336",
              "description": "Improper Neutralization of Special Elements Used in a Template Engine",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T12:05:34.113Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern/commit/d723de621d5b3a340f3cc4d5b46bfe40a9a3124e"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern"
        },
        {
          "name": "Vulnerable code: block.py (sandboxed first render, non-sandboxed second render)",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern/blob/v1.0.44/skyvern/forge/sdk/workflow/models/block.py"
        },
        {
          "name": "Vulnerable code: prompting.py (PromptEngine uses a plain jinja2.Environment)",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern/blob/v1.0.44/skyvern/forge/sdk/prompting.py"
        },
        {
          "name": "VulnCheck Advisory: Skyvern before 1.0.45 Sandbox Escape via TextPromptBlock",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/skyvern-before-1.0.45-sandbox-escape-via-textpromptblock"
        }
      ],
      "title": "Skyvern before 1.0.45 Sandbox Escape via TextPromptBlock",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-82447",
    "datePublished": "2026-08-29T12:05:34.113Z",
    "dateReserved": "2026-08-29T11:37:29.518Z",
    "dateUpdated": "2026-08-29T12:05:34.113Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-82447 (GCVE-0-2026-82447)

    Vulnerability from cvelistv5 – Published: 2026-08-29 12:05 – Updated: 2026-08-29 12:05
    VLAI
    Title
    Skyvern before 1.0.45 Sandbox Escape via TextPromptBlock
    Summary
    Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges.
    Severity
    8.7 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
    8.8 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    CWE
    • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
    Assigner
    References
    Impacted products
    Vendor Product Version
    Skyvern-AI skyvern Affected: 0.2.1 , < 1.0.45 (semver)
    		Create a notification for this product.
    Date Public
    2026-07-06 00:00
    Credits
    hayato1121
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/skyvern",
          "product": "skyvern",
          "vendor": "Skyvern-AI",
          "versions": [
            {
              "lessThan": "1.0.45",
              "status": "affected",
              "version": "0.2.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "hayato1121"
        }
      ],
      "datePublic": "2026-07-06T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "Improper Neutralization of Special Elements Used in a Template Engine",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T12:05:34.113Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "Patch Commit",
          "tags": [
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          ],
          "url": "https://github.com/Skyvern-AI/skyvern/commit/d723de621d5b3a340f3cc4d5b46bfe40a9a3124e"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern"
        },
        {
          "name": "Vulnerable code: block.py (sandboxed first render, non-sandboxed second render)",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern/blob/v1.0.44/skyvern/forge/sdk/workflow/models/block.py"
        },
        {
          "name": "Vulnerable code: prompting.py (PromptEngine uses a plain jinja2.Environment)",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/Skyvern-AI/skyvern/blob/v1.0.44/skyvern/forge/sdk/prompting.py"
        },
        {
          "name": "VulnCheck Advisory: Skyvern before 1.0.45 Sandbox Escape via TextPromptBlock",
          "tags": [
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          ],
          "url": "https://www.vulncheck.com/advisories/skyvern-before-1.0.45-sandbox-escape-via-textpromptblock"
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      ],
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    }
  },
  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
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    "dateReserved": "2026-08-29T11:37:29.518Z",
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