usn-7951-1
Vulnerability from osv_ubuntu
Published
2026-01-12 06:40
Modified
2026-04-27 14:11
Summary
python3.8, python3.9, python3.10, python3.11, python3.12, python3.13,
python3.14 vulnerability
Details
It was discovered that Python's http.client did not properly handle the Content-Length header in HTTP responses. A malicious server could exploit this to cause Python to allocate excessive memory, leading to a denial of service.
References
| URL | Type | |
|---|---|---|
{
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{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2025-13836",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
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{
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}
]
}
],
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}
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},
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{
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{
"id": "CVE-2025-13836",
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{
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{
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"id": "CVE-2025-13836",
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"availability": "No subscription required",
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"3.10.6-1~22.04.2",
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{
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{
"binary_name": "libpython3.13-stdlib",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "libpython3.13-testsuite",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-examples",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-full",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-gdbm",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-minimal",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-nopie",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-tk",
"binary_version": "3.13.7-1ubuntu0.2"
},
{
"binary_name": "python3.13-venv",
"binary_version": "3.13.7-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "python3.13",
"purl": "pkg:deb/ubuntu/python3.13@3.13.7-1ubuntu0.2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.13.7-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.13.3-1",
"3.13.3-2",
"3.13.3-4",
"3.13.4-1",
"3.13.5-1",
"3.13.5-2",
"3.13.6-1",
"3.13.7-1",
"3.13.7-1ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2025-13836",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "idle-python3.14",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "libpython3.14",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "libpython3.14-minimal",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "libpython3.14-stdlib",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "libpython3.14-testsuite",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-examples",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-full",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-gdbm",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-minimal",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-nopie",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-tk",
"binary_version": "3.14.0-1ubuntu0.1"
},
{
"binary_name": "python3.14-venv",
"binary_version": "3.14.0-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "python3.14",
"purl": "pkg:deb/ubuntu/python3.14@3.14.0-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.14.0-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.14.0~a7-0ubuntu1",
"3.14.0~b1-1",
"3.14.0~b3-1",
"3.14.0~rc1-1",
"3.14.0~rc2-1",
"3.14.0~rc3-1",
"3.14.0-1"
]
}
],
"aliases": [],
"details": "It was discovered that Python\u0027s http.client did not properly handle the\nContent-Length header in HTTP responses. A malicious server could exploit\nthis to cause Python to allocate excessive memory, leading to a denial of\nservice.",
"id": "USN-7951-1",
"modified": "2026-04-27T14:11:47Z",
"published": "2026-01-12T06:40:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7951-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-13836"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "python3.8, python3.9, python3.10, python3.11, python3.12, python3.13,\npython3.14 vulnerability",
"upstream": [
"UBUNTU-CVE-2025-13836"
]
}
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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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