HighFix available
squid — security advisory
An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.
- Products
- squid
- Affected versions
- Not specified
- Fixed versions
- 4.12.0-r0
- CVEs
- CVE-2020-15049
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:03 UTC · Revision 1
Source evidence
An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.
osv:ALPINE-CVE-2020-15049
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
squid
Fixed versions: 4.12.0-r0
Complete source record
{
"id": "f526eeb133633e6c35dacc3a8de216c3e3bf9e4ab58463afa3db9ddc7e849c0a",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-15049",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2020-15049",
"summary": "An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing \"+\\ \"-\" or an uncommon shell whitespace character prefix to the length field-value.",
"evidence": "osv:ALPINE-CVE-2020-15049",
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{
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{
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{
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{
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],
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}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2020-15049",
"aliases": [
"ALPINE-CVE-2020-15049"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
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{
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"events": [
{
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},
{
"fixed": "4.12.0-r0"
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]
}
],
"package": {
"name": "squid",
"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15049.json"
},
"ecosystem_specific": {}
},
{
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},
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],
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"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.21"
},
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},
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],
"package": {
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"ecosystem": "Alpine:v3.23"
},
"database_specific": {
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},
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},
{
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],
"package": {
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},
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},
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}
],
"modified": "2026-10-26T11:17:55.128885720Z",
"provider": "osv",
"upstream": [
"CVE-2020-15049"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-15049"
]
},
"related_cves": [
{
"value": "CVE-2020-15049",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450432,
"published_at": "2020-06-30T18:15:12.367+00:00"
}