FKIE_CVE-2026-6019

Vulnerability from fkie_nvd - Published: 2026-04-22 20:16 - Updated: 2026-05-28 19:15
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
References
cna@python.orghttps://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76cPatch
cna@python.orghttps://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104Patch
cna@python.orghttps://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8Patch
cna@python.orghttps://github.com/python/cpython/issues/90309Exploit, Issue Tracking
cna@python.orghttps://github.com/python/cpython/pull/148848Issue Tracking, Patch
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/Mailing List, Vendor Advisory
Impacted products
Vendor Product Version
python python *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "43B0671A-35BB-4EE4-8A68-E79B62A75547",
              "versionEndExcluding": "3.15.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "http.cookies.Morsel.js_output() returns an inline \u003cscript\u003e snippet and only escapes \" for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence \u003c/script\u003e inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value."
    }
  ],
  "id": "CVE-2026-6019",
  "lastModified": "2026-05-28T19:15:28.540",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.1,
          "baseSeverity": "LOW",
          "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": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/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",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@python.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-22T20:16:42.617",
  "references": [
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Exploit",
        "Issue Tracking"
      ],
      "url": "https://github.com/python/cpython/issues/90309"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/python/cpython/pull/148848"
    },
    {
      "source": "cna@python.org",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/"
    }
  ],
  "sourceIdentifier": "cna@python.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-150"
        }
      ],
      "source": "cna@python.org",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.