Medium
Security advisory
An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-11386
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:36 UTC · Revision 1
Source evidence
An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.
osv:CVE-2018-11386
Complete source record
{
"id": "d323ca130dc629e7d8774394cf9634b0af321243ac573f309db98f5c4ede4ecf",
"url": "https://osv.dev/vulnerability/CVE-2018-11386",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-11386",
"summary": "An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.",
"evidence": "osv:CVE-2018-11386",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-11386",
"aliases": [
"CVE-2018-11386",
"GHSA-r2rq-3h56-fqm4"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
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"type": "GIT",
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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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"database_specific": {
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{
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{
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"database_specific": {
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{
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"source": "CPE_RANGE"
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{
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{
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"versions": [
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"database_specific": {
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}
}
],
"modified": "2026-10-24T10:30:55.716284185Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH/",
"https://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandler",
"https://www.debian.org/security/2018/dsa-4262"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
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],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-11386",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438482,
"published_at": "2018-06-13T16:29:00.627+00:00"
}