FKIE_CVE-2026-102991

Vulnerability from fkie_nvd - Published: 2026-09-30 20:17 - Updated: 2026-09-30 20:17
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Summary
Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the configured template directory. An application that passes attacker-controlled template names or include paths can disclose process-readable files on the same volume, and a targeted file containing Mako template syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include expressions can preserve it. This issue is fixed in version 1.4.2.
References
security-advisories@github.comhttps://github.com/sqlalchemy/mako/commit/000ed85e4e48771eff460bf4fc721fb43de80e08
security-advisories@github.comhttps://github.com/sqlalchemy/mako/issues/441
security-advisories@github.comhttps://github.com/sqlalchemy/mako/releases/tag/rel_1_4_2
security-advisories@github.comhttps://github.com/sqlalchemy/mako/security/advisories/GHSA-5639-2j2p-m4mx
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/sqlalchemy/mako/security/advisories/GHSA-5639-2j2p-m4mx
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mako",
          "vendor": "sqlalchemy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.4.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the configured template directory. An application that passes attacker-controlled template names or include paths can disclose process-readable files on the same volume, and a targeted file containing Mako template syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include expressions can preserve it. This issue is fixed in version 1.4.2."
    }
  ],
  "id": "CVE-2026-102991",
  "lastModified": "2026-09-30T20:17:26.973",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-102991",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-30T19:54:27.628844Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-30T20:17:26.547",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sqlalchemy/mako/commit/000ed85e4e48771eff460bf4fc721fb43de80e08"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sqlalchemy/mako/issues/441"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sqlalchemy/mako/releases/tag/rel_1_4_2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sqlalchemy/mako/security/advisories/GHSA-5639-2j2p-m4mx"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/sqlalchemy/mako/security/advisories/GHSA-5639-2j2p-m4mx"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}



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