squid — security advisory
Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version 6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. Those who you use a prepackaged version of Squid should refer to the package vendor for availability information on updated packages.
- Products
- squid
- Affected versions
- Not specified
- Fixed versions
- 6.4-r0
- CVEs
- CVE-2023-46724
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 15:01 UTC · Revision 1
Source evidence
Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version 6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. Those who you use a prepackaged version of Squid should refer to the package vendor for availability information on updated packages.
osv:ALPINE-CVE-2023-46724
squid
Fixed versions: 6.4-r0
squid
Fixed versions: 6.4-r0
squid
Fixed versions: 6.4-r0
squid
Fixed versions: 6.4-r0
squid
Fixed versions: 6.4-r0
squid
Fixed versions: 6.4-r0
Complete source record
{
"id": "e546295b7536142f94ed1deb65f6bc9dfe9f3e9fb5d84d902cce2506f04b8be7",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2023-46724",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2023-46724",
"summary": "Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version 6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. Those who you use a prepackaged version of Squid should refer to the package vendor for availability information on updated packages.",
"evidence": "osv:ALPINE-CVE-2023-46724",
"products": [
{
"name": {
"value": "squid",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.4-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "squid",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.4-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "squid",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "squid",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.4-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "squid",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
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},
"prerequisites": [],
"fixed_versions": [
{
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}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2023-46724",
"aliases": [
"ALPINE-CVE-2023-46724"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.3.0.1"
},
{
"fixed": "6.4-r0"
}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
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},
"ecosystem_specific": {}
},
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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"introduced": "3.3.0.1"
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"fixed": "6.4-r0"
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}
],
"package": {
"name": "squid",
"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2023-46724.json"
},
"ecosystem_specific": {}
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{
"ranges": [
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"type": "ECOSYSTEM",
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{
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}
]
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],
"package": {
"name": "squid",
"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2023-46724.json"
},
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{
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"package": {
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"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2023-46724.json"
},
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{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2023-46724.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.3.0.1"
},
{
"fixed": "6.4-r0"
}
]
}
],
"package": {
"name": "squid",
"purl": "pkg:apk/alpine/squid?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2023-46724.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-26T17:17:58.648838478Z",
"provider": "osv",
"upstream": [
"CVE-2023-46724"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2023-46724"
]
},
"related_cves": [
{
"value": "CVE-2023-46724",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 454524,
"published_at": "2023-11-01T20:15:08.8+00:00"
}