FKIE_CVE-2026-6019
Vulnerability from fkie_nvd - Published: 2026-04-22 20:16 - Updated: 2026-07-27 17:34
Severity
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
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "CPython",
"repo": "https://github.com/python/cpython",
"vendor": "Python Software Foundation",
"versions": [
{
"lessThan": "3.13.14",
"status": "affected",
"version": "0",
"versionType": "python"
},
{
"lessThan": "3.14.5rc1",
"status": "affected",
"version": "3.14.0a1",
"versionType": "python"
},
{
"lessThan": "3.15.0b1",
"status": "affected",
"version": "3.15.0a1",
"versionType": "python"
}
]
}
],
"source": "cna@python.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"matchCriteriaId": "16DAC42F-7128-49F8-B799-78D78580EC70",
"versionEndExcluding": "3.13.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E819F5F6-4D1E-4965-BAEA-B730ECE9713C",
"versionEndIncluding": "3.14.4",
"versionStartIncluding": "3.14.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*",
"matchCriteriaId": "A3327507-0B1D-4F28-A983-D07A2C8A7696",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*",
"matchCriteriaId": "C8AF17F1-A27F-4C98-BA5A-B4319710E8D1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*",
"matchCriteriaId": "24CF56B0-2F4E-42A2-B655-F493AA0A4815",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*",
"matchCriteriaId": "7184ABBA-B100-489E-B5C1-1C9EEC0546CA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*",
"matchCriteriaId": "B6D4181B-3E1B-499B-AAB1-50868A6A6AD3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*",
"matchCriteriaId": "A52F6DD2-717D-4E8C-8DB7-00890BC1ABAE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*",
"matchCriteriaId": "8C46C55C-801E-4F86-B669-8E6A12B4AB6F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:3.15.0:alpha8:*:*:*:*:*:*",
"matchCriteriaId": "5A8DF8E5-61F9-4899-BF40-41A17E223441",
"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": "2026-07-27T17:34:54.330",
"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"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-6019",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-22T20:02:17.071906Z",
"version": "2.0.3"
}
}
]
},
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| 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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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