FKIE_CVE-2025-13836
Vulnerability from fkie_nvd - Published: 2025-12-01 18:16 - Updated: 2026-06-17 08:34
Severity
Summary
When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.
References
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"modules": [
"http.client"
],
"product": "CPython",
"repo": "https://github.com/python/cpython",
"vendor": "Python Software Foundation",
"versions": [
{
"lessThan": "3.10.20",
"status": "affected",
"version": "0",
"versionType": "python"
},
{
"lessThan": "3.11.15",
"status": "affected",
"version": "3.11.0",
"versionType": "python"
},
{
"lessThan": "3.12.13",
"status": "affected",
"version": "3.12.0",
"versionType": "python"
},
{
"lessThan": "3.13.11",
"status": "affected",
"version": "3.13.0",
"versionType": "python"
},
{
"lessThan": "3.14.1",
"status": "affected",
"version": "3.14.0",
"versionType": "python"
},
{
"lessThan": "3.15.0a3",
"status": "affected",
"version": "3.15.0a1",
"versionType": "python"
}
]
}
],
"source": "cna@python.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1F853468-5391-4279-B369-E480A2B91D6C",
"versionEndExcluding": "3.10.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"matchCriteriaId": "7B38F8DA-DD8F-4887-AC85-CE843E21AD74",
"versionEndExcluding": "3.11.15",
"versionStartIncluding": "3.11.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"matchCriteriaId": "963DB620-5766-4093-A80B-03F7975F712B",
"versionEndExcluding": "3.12.13",
"versionStartIncluding": "3.12.0",
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},
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"versionEndExcluding": "3.13.11",
"versionStartIncluding": "3.13.0",
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},
{
"criteria": "cpe:2.3:a:python:python:3.14.0:-:*:*:*:*:*:*",
"matchCriteriaId": "D9A884CF-F98D-490D-A3B6-74F0DBFC3BD3",
"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
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS."
},
{
"lang": "es",
"value": "Al leer una respuesta HTTP de un servidor, si no se especifica una cantidad de lectura, el comportamiento predeterminado ser\u00e1 usar Content-Length. Esto permite a un servidor malicioso hacer que el cliente lea grandes cantidades de datos en la memoria, lo que podr\u00eda causar OOM u otro DoS."
}
],
"id": "CVE-2025-13836",
"lastModified": "2026-06-17T08:34:50.760",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"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": 6.3,
"baseSeverity": "MEDIUM",
"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": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "cna@python.org",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-13836",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-12-01T18:32:37.506031Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-12-01T18:16:04.200",
"references": [
{
"source": "cna@python.org",
"tags": [
"Patch"
],
"url": "https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628"
},
{
"source": "cna@python.org",
"tags": [
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],
"url": "https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15"
},
{
"source": "cna@python.org",
"tags": [
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],
"url": "https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155"
},
{
"source": "cna@python.org",
"tags": [
"Patch"
],
"url": "https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5"
},
{
"source": "cna@python.org",
"tags": [
"Patch"
],
"url": "https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0"
},
{
"source": "cna@python.org",
"tags": [
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],
"url": "https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587c"
},
{
"source": "cna@python.org",
"tags": [
"Issue Tracking",
"Patch"
],
"url": "https://github.com/python/cpython/issues/119451"
},
{
"source": "cna@python.org",
"tags": [
"Issue Tracking",
"Patch"
],
"url": "https://github.com/python/cpython/pull/119454"
},
{
"source": "cna@python.org",
"tags": [
"Vendor Advisory"
],
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/"
}
],
"sourceIdentifier": "cna@python.org",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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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
| 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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