High
Security advisory
An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-18887
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:52 UTC · Revision 1
Source evidence
An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.
osv:CVE-2019-18887
Complete source record
{
"id": "6bad208a1477048dd751589ad3e8c7c2ace79e15ca58e426dee8d01096a43bc8",
"url": "https://osv.dev/vulnerability/CVE-2019-18887",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-18887",
"summary": "An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.",
"evidence": "osv:CVE-2019-18887",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2019-18887",
"aliases": [
"CVE-2019-18887",
"GHSA-q8hg-pf8v-cxrv"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/symfony/security-http",
"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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"v2.8.17",
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"v2.8.15",
"v2.8.14",
"v2.8.13",
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"database_specific": {
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}
},
{
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"type": "GIT",
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{
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{
"last_affected": "fb4065ac95f08ca26ee605936e537ba2cd4a6bb7"
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{
"fixed": "87fb08703e62882a7a6fdb17672070e0ee12dd65"
}
],
"database_specific": {
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{
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}
],
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},
{
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"range": [
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"introduced": "3.4.0"
},
{
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}
],
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},
{
"cpe": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
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{
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{
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}
],
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},
{
"range": [
{
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}
],
"source": "REFERENCES_TAG",
"original_tag": "v4.3.8"
}
]
}
}
],
"versions": [
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"v3.4.34",
"v4.3.6",
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}
}
],
"modified": "2026-10-24T10:50:35.298279677Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ/",
"https://github.com/symfony/symfony/releases/tag/v4.3.8",
"https://symfony.com/blog/cve-2019-18887-use-constant-time-comparison-in-urisigner",
"https://symfony.com/blog/symfony-4-3-8-released"
],
"provider_metadata": {
"unresolved_ranges": [
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"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
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{
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{
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},
{
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],
"source": "CPE_STRING"
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]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-18887",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442322,
"published_at": "2019-11-21T23:15:13.403+00:00"
}