MediumFix available
python2.7, python3.4 and 2 more products — security advisory
http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3.
- Products
- python2.7, python3.4, python3.5, python3.6
- Affected versions
- 2.7.10-4ubuntu1, 2.7.10-4ubuntu2, 2.7.11-2, 2.7.11-3, 2.7.11-4, 2.7.11-6, 2.7.11-7, 2.7.11-7ubuntu1, 2.7.12-1ubuntu0~16.04.1, 2.7.12-1ubuntu0~16.04.2, 2.7.12-1ubuntu0~16.04.3, 2.7.12-1ubuntu0~16.04.4, 2.7.12-1~16.04, 2.7.14-2ubuntu2, 2.7.14-4, 2.7.14-6, 2.7.14-7, 2.7.14-8, 2.7.15-4ubuntu4~18.04, 2.7.15~rc1-1, 2.7.15~rc1-1ubuntu0.1, 2.7.5-8ubuntu3, 2.7.5-8ubuntu4, 2.7.6-2, 2.7.6-2ubuntu1, 2.7.6-3, 2.7.6-3ubuntu1, 2.7.6-4, 2.7.6-4ubuntu1, 2.7.6-5, 2.7.6-7, 2.7.6-8, 2.7.6-8ubuntu0.2, 2.7.6-8ubuntu0.3, 2.7.6-8ubuntu0.4, 2.7.6-8ubuntu0.5, 3.4.0-1, 3.4.0-2ubuntu1, 3.4.0-2ubuntu1.1, 3.4.3-1ubuntu1~14.04.1, 3.4.3-1ubuntu1~14.04.3, 3.4.3-1ubuntu1~14.04.4, 3.4.3-1ubuntu1~14.04.5, 3.4.3-1ubuntu1~14.04.6, 3.4.3-1ubuntu1~14.04.7, 3.4~b1-0ubuntu3, 3.4~b1-4ubuntu4, 3.4~b1-4ubuntu6, 3.4~b1-5ubuntu2, 3.4~b2-1, 3.4~b3-1ubuntu1, 3.4~rc1-1build1, 3.4~rc2-1, 3.4~rc3-0ubuntu1, 3.5.0-3, 3.5.0-3ubuntu1, 3.5.1-1, 3.5.1-10, 3.5.1-2, 3.5.1-3, 3.5.1-5, 3.5.1-6ubuntu1, 3.5.1-6ubuntu2, 3.5.1-9ubuntu1, 3.5.1~rc1-2ubuntu1, 3.5.2-2ubuntu0~16.04.1, 3.5.2-2ubuntu0~16.04.2, 3.5.2-2ubuntu0~16.04.3, 3.5.2-2ubuntu0~16.04.4, 3.5.2-2ubuntu0~16.04.4~14.04.1, 3.5.2-2ubuntu0~16.04.5, 3.5.2-2~16.01, 3.5.2-2~16.04, 3.6.3-1ubuntu1, 3.6.4-1, 3.6.4-2, 3.6.4-3build1, 3.6.4-4, 3.6.4~rc1-1, 3.6.4~rc1-2, 3.6.5-3, 3.6.5~rc1-1, 3.6.6-1~18.04, 3.6.7-1~18.04, 3.6.8-1~18.04.1
- Fixed versions
- 2.7.12-1ubuntu0~16.04.8, 2.7.15-4ubuntu4~18.04.1, 2.7.6-8ubuntu0.6+esm2, 3.4.3-1ubuntu1~14.04.7+esm2, 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1, 3.5.2-2ubuntu0~16.04.8, 3.6.8-1~18.04.2
- CVEs
- CVE-2018-20852
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 10:03 UTC · Revision 1
Source evidence
http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3.
osv:UBUNTU-CVE-2018-20852
python2.7
Fixed versions: 2.7.6-8ubuntu0.6+esm2
python3.4
Fixed versions: 3.4.3-1ubuntu1~14.04.7+esm2
python3.5
Fixed versions: 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1
python2.7
Fixed versions: 2.7.12-1ubuntu0~16.04.8
python3.5
Fixed versions: 3.5.2-2ubuntu0~16.04.8
python2.7
Fixed versions: 2.7.15-4ubuntu4~18.04.1
python3.6
Fixed versions: 3.6.8-1~18.04.2
Complete source record
{
"id": "0a110538bb930dcd20209b92b647ac57d0d76ff11700d61c2ea560e7c972e13e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-20852",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2018-20852",
"summary": "http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3.",
"evidence": "osv:UBUNTU-CVE-2018-20852",
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{
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{
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{
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{
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{
"value": "3.4.0-2ubuntu1",
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{
"value": "3.4.0-2ubuntu1.1",
"evidence": "/affected/1/versions"
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{
"value": "3.4.3-1ubuntu1~14.04.1",
"evidence": "/affected/1/versions"
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{
"value": "3.4.3-1ubuntu1~14.04.3",
"evidence": "/affected/1/versions"
},
{
"value": "3.4.3-1ubuntu1~14.04.4",
"evidence": "/affected/1/versions"
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{
"value": "3.4.3-1ubuntu1~14.04.5",
"evidence": "/affected/1/versions"
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{
"value": "3.4.3-1ubuntu1~14.04.6",
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{
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"name": {
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"evidence": "/affected/2/package/name"
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{
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{
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{
"name": {
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{
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],
"affected_versions": [
{
"value": "2.7.10-4ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.10-4ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.11-2",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.11-3",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.11-4",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.11-6",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.11-7",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.11-7ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.12-1~16.04",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.12-1ubuntu0~16.04.1",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.12-1ubuntu0~16.04.2",
"evidence": "/affected/3/versions"
},
{
"value": "2.7.12-1ubuntu0~16.04.3",
"evidence": "/affected/3/versions"
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{
"value": "2.7.12-1ubuntu0~16.04.4",
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},
{
"name": {
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"evidence": "/affected/4/package/name"
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{
"value": "3.5.2-2ubuntu0~16.04.8",
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],
"affected_versions": [
{
"value": "3.5.0-3",
"evidence": "/affected/4/versions"
},
{
"value": "3.5.0-3ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "3.5.1~rc1-2ubuntu1",
"evidence": "/affected/4/versions"
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{
"value": "3.5.1-1",
"evidence": "/affected/4/versions"
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{
"value": "3.5.1-2",
"evidence": "/affected/4/versions"
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{
"value": "3.5.1-3",
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{
"value": "3.5.1-5",
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{
"value": "3.5.1-6ubuntu1",
"evidence": "/affected/4/versions"
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{
"value": "3.5.1-6ubuntu2",
"evidence": "/affected/4/versions"
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{
"value": "3.5.1-9ubuntu1",
"evidence": "/affected/4/versions"
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{
"value": "3.5.1-10",
"evidence": "/affected/4/versions"
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{
"value": "3.5.2-2~16.01",
"evidence": "/affected/4/versions"
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{
"value": "3.5.2-2~16.04",
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{
"value": "3.5.2-2ubuntu0~16.04.1",
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{
"value": "3.5.2-2ubuntu0~16.04.2",
"evidence": "/affected/4/versions"
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{
"value": "3.5.2-2ubuntu0~16.04.3",
"evidence": "/affected/4/versions"
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{
"value": "3.5.2-2ubuntu0~16.04.4",
"evidence": "/affected/4/versions"
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{
"value": "3.5.2-2ubuntu0~16.04.5",
"evidence": "/affected/4/versions"
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]
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{
"name": {
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{
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"evidence": "/affected/5/ranges"
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],
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{
"value": "2.7.14-2ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.14-4",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.14-6",
"evidence": "/affected/5/versions"
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{
"value": "2.7.14-7",
"evidence": "/affected/5/versions"
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{
"value": "2.7.14-8",
"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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],
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{
"value": "3.6.3-1ubuntu1",
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{
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"evidence": "/affected/6/versions"
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{
"value": "3.6.4~rc1-2",
"evidence": "/affected/6/versions"
},
{
"value": "3.6.4-1",
"evidence": "/affected/6/versions"
},
{
"value": "3.6.4-2",
"evidence": "/affected/6/versions"
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{
"value": "3.6.4-3build1",
"evidence": "/affected/6/versions"
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{
"value": "3.6.4-4",
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{
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{
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2018-20852",
"aliases": [
"UBUNTU-CVE-2018-20852"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "CVSS_V3",
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},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libpython2.7",
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{
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{
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},
{
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],
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}
},
{
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{
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}
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}
],
"package": {
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},
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"3.4.3-1ubuntu1~14.04.7"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20852.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "idle-python3.4",
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},
{
"binary_name": "libpython3.4",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm2"
},
{
"binary_name": "libpython3.4-minimal",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm2"
},
{
"binary_name": "libpython3.4-stdlib",
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},
{
"binary_name": "libpython3.4-testsuite",
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},
{
"binary_name": "python3.4",
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},
{
"binary_name": "python3.4-examples",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm2"
},
{
"binary_name": "python3.4-minimal",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm2"
},
{
"binary_name": "python3.4-venv",
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}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.2-2ubuntu0~16.04.4~14.04.1+esm1"
}
]
}
],
"package": {
"name": "python3.5",
"purl": "pkg:deb/ubuntu/python3.5?arch=source&distro=trusty%2Fesm",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"3.5.2-2ubuntu0~16.04.4~14.04.1"
],
"database_specific": {
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"modified": "2026-10-08T19:46:17.718129825Z",
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"references": [
"https://ubuntu.com/security/CVE-2018-20852",
"https://python-security.readthedocs.io/vuln/cookie-domain-check.html",
"https://ubuntu.com/security/notices/USN-4127-1",
"https://ubuntu.com/security/notices/USN-4127-2",
"https://www.cve.org/CVERecord?id=CVE-2018-20852",
"https://ubuntu.com/security/notices/USN-6891-1"
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"evidence": "/upstream"
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"source_id": "core-osv",
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"published_at": "2019-07-13T00:00:00+00:00"
}