High
Security advisory
An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-18679
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 10:38 UTC · Revision 1
Source evidence
An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.
osv:CVE-2019-18679
Complete source record
{
"id": "49a355a5793ae93aa9513a1d196c89309495dd6ebf5009fc6173327fb6cdef5b",
"url": "https://osv.dev/vulnerability/CVE-2019-18679",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-18679",
"summary": "An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.",
"evidence": "osv:CVE-2019-18679",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2019-18679",
"aliases": [
"CVE-2019-18679"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/squid-cache/squid",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "6cfeb300caf423ff49a0511d8bd43a56f3418273"
},
{
"last_affected": "fede82b3e7aa1f12a91bade17f6ac0d4c7463e0a"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0"
},
{
"last_affected": "3.5.28"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.0"
},
{
"last_affected": "4.8"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"SQUID_4_8",
"SQUID_4_7",
"SQUID_4_6",
"SQUID_4_5",
"SQUID_4_4",
"SQUID_3_5_28",
"SQUID_4_3",
"SQUID_4_2",
"SQUID_4_1",
"SQUID_4_0_25",
"SQUID_4_0_24",
"SQUID_4_0_23",
"SQUID_4_0_22",
"SQUID_4_0_21",
"SQUID_3_5_26",
"SQUID_4_0_20",
"SQUID_3_5_25",
"SQUID_4_0_19",
"SQUID_3_5_24",
"SQUID_4_0_18",
"SQUID_3_5_23",
"SQUID_4_0_17",
"SQUID_4_0_16",
"SQUID_3_5_22",
"SQUID_4_0_15",
"SQUID_3_5_21",
"SQUID_4_0_14",
"SQUID_4_0_13",
"SQUID_3_5_20",
"SQUID_4_0_12",
"SQUID_4_0_11",
"SQUID_3_5_19",
"SQUID_4_0_10",
"SQUID_3_5_18",
"SQUID_3_5_17",
"SQUID_4_0_9",
"SQUID_3_5_16",
"SQUID_4_0_8",
"SQUID_3_5_15",
"SQUID_4_0_7",
"SQUID_3_5_14",
"SQUID_4_0_6",
"SQUID_4_0_5",
"SQUID_3_5_13",
"SQUID_4_0_4",
"SQUID_3_5_12",
"SQUID_4_0_3",
"SQUID_3_5_11",
"SQUID_4_0_2",
"SQUID_4_0_1",
"SQUID_3_5_10",
"SQUID_3_5_9",
"SQUID_3_5_8",
"SQUID_3_5_7",
"SQUID_3_5_6",
"SQUID_3_5_5",
"SQUID_3_5_4",
"SQUID_3_5_3",
"SQUID_3_5_2",
"SQUID_3_5_1",
"SQUID_3_5_0_4",
"SQUID_3_5_0_3",
"SQUID_3_5_0_2",
"SQUID_3_5_0_1",
"take00",
"SQUID_3_0_RC1",
"SQUID_3_0_PRE7",
"SQUID_3_0_PRE6",
"SQUID_3_0_PRE5",
"SQUID_3_0_PRE4",
"SQUID_3_0_PRE3",
"SQUID_3_0_PRE2",
"SQUID_3_0_PRE1",
"HISTORIC_RELEASES"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18679.json"
}
}
],
"modified": "2026-10-20T10:50:50.481093691Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/",
"https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html",
"https://security.gentoo.org/glsa/202003-34",
"https://usn.ubuntu.com/4213-1/",
"https://www.debian.org/security/2020/dsa-4682",
"https://bugzilla.suse.com/show_bug.cgi?id=1156324",
"https://github.com/squid-cache/squid/pull/491"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*"
],
"vendor_product": "squid-cache:squid",
"extracted_events": [
{
"range": [
{
"introduced": "2.0"
},
{
"last_affected": "2.7"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "19.04"
},
{
"last_affected": "19.04"
},
{
"introduced": "19.10"
},
{
"last_affected": "19.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "30"
},
{
"last_affected": "30"
},
{
"introduced": "31"
},
{
"last_affected": "31"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:squid-cache:squid:2.7:stable2:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable3:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable4:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable5:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable6:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable7:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable8:*:*:*:*:*:*",
"cpe:2.3:a:squid-cache:squid:2.7:stable9:*:*:*:*:*:*"
],
"vendor_product": "squid-cache:squid",
"extracted_events": [
{
"range": [
{
"introduced": "2.7-stable2"
},
{
"last_affected": "2.7-stable2"
},
{
"introduced": "2.7-stable3"
},
{
"last_affected": "2.7-stable3"
},
{
"introduced": "2.7-stable4"
},
{
"last_affected": "2.7-stable4"
},
{
"introduced": "2.7-stable5"
},
{
"last_affected": "2.7-stable5"
},
{
"introduced": "2.7-stable6"
},
{
"last_affected": "2.7-stable6"
},
{
"introduced": "2.7-stable7"
},
{
"last_affected": "2.7-stable7"
},
{
"introduced": "2.7-stable8"
},
{
"last_affected": "2.7-stable8"
},
{
"introduced": "2.7-stable9"
},
{
"last_affected": "2.7-stable9"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-18679",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 382226,
"published_at": "2019-11-26T17:15:13.047+00:00"
}