MediumFix available
curl — security advisory
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAX
- Products
- curl
- Affected versions
- 7.65.3-1ubuntu3, 7.65.3-1ubuntu4, 7.66.0-1ubuntu1, 7.67.0-2ubuntu1, 7.68.0-1ubuntu1, 7.68.0-1ubuntu2, 7.68.0-1ubuntu2.1, 7.68.0-1ubuntu2.10, 7.68.0-1ubuntu2.11, 7.68.0-1ubuntu2.12, 7.68.0-1ubuntu2.13, 7.68.0-1ubuntu2.14, 7.68.0-1ubuntu2.15, 7.68.0-1ubuntu2.16, 7.68.0-1ubuntu2.18, 7.68.0-1ubuntu2.19, 7.68.0-1ubuntu2.2, 7.68.0-1ubuntu2.20, 7.68.0-1ubuntu2.21, 7.68.0-1ubuntu2.22, 7.68.0-1ubuntu2.23, 7.68.0-1ubuntu2.24, 7.68.0-1ubuntu2.25, 7.68.0-1ubuntu2.25+esm2, 7.68.0-1ubuntu2.4, 7.68.0-1ubuntu2.5, 7.68.0-1ubuntu2.6, 7.68.0-1ubuntu2.7, 7.74.0-1.3ubuntu2, 7.74.0-1.3ubuntu3, 7.80.0-3, 7.81.0-1, 7.81.0-1ubuntu1.1, 7.81.0-1ubuntu1.10, 7.81.0-1ubuntu1.11, 7.81.0-1ubuntu1.13, 7.81.0-1ubuntu1.14, 7.81.0-1ubuntu1.15, 7.81.0-1ubuntu1.16, 7.81.0-1ubuntu1.17, 7.81.0-1ubuntu1.18, 7.81.0-1ubuntu1.19, 7.81.0-1ubuntu1.2, 7.81.0-1ubuntu1.20, 7.81.0-1ubuntu1.21, 7.81.0-1ubuntu1.22, 7.81.0-1ubuntu1.3, 7.81.0-1ubuntu1.4, 7.81.0-1ubuntu1.6, 7.81.0-1ubuntu1.7, 7.81.0-1ubuntu1.8, 8.12.1-3ubuntu1, 8.13.0-5ubuntu1, 8.14.1-1ubuntu2, 8.14.1-1ubuntu3, 8.14.1-2ubuntu1, 8.14.1-2ubuntu1.1, 8.17.0-1ubuntu1, 8.18.0-1ubuntu1, 8.2.1-1ubuntu3, 8.2.1-1ubuntu3.1, 8.4.0-2ubuntu1, 8.5.0-2ubuntu1, 8.5.0-2ubuntu10, 8.5.0-2ubuntu10.1, 8.5.0-2ubuntu10.2, 8.5.0-2ubuntu10.3, 8.5.0-2ubuntu10.4, 8.5.0-2ubuntu10.5, 8.5.0-2ubuntu10.6, 8.5.0-2ubuntu10.7, 8.5.0-2ubuntu2, 8.5.0-2ubuntu8, 8.5.0-2ubuntu9
- Fixed versions
- 7.68.0-1ubuntu2.25+esm3, 7.81.0-1ubuntu1.23, 8.14.1-2ubuntu1.2, 8.18.0-1ubuntu2, 8.5.0-2ubuntu10.8
- CVEs
- CVE-2026-1965
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:56 UTC · Revision 1
Source evidence
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAX
osv:UBUNTU-CVE-2026-1965
curl
Fixed versions: 7.68.0-1ubuntu2.25+esm3
curl
Fixed versions: 7.81.0-1ubuntu1.23
curl
Fixed versions: 8.5.0-2ubuntu10.8
curl
Fixed versions: 8.14.1-2ubuntu1.2
curl
Fixed versions: 8.18.0-1ubuntu2
curl
Fixed versions: 8.18.0-1ubuntu2
Complete source record
{
"id": "71a17d9b5fd209d59a8296607c60f55aed878583fce1f64d3167d0c1082398e4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-1965",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-1965",
"summary": "libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates *connections* and not *requests*, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with `user1:password1` and then does another operation to the same server also using Negotiate but with `user2:password2` (while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set with `CURLOPT_HTTPAUTH`. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused: `CURLOPT_FRESH_CONNECT`, `CURLOPT_MAX",
"evidence": "osv:UBUNTU-CVE-2026-1965",
"products": [
{
"name": {
"value": "curl",
"evidence": "/affected/0/package/name"
},
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{
"value": "7.68.0-1ubuntu2.25+esm3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "7.65.3-1ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "7.65.3-1ubuntu4",
"evidence": "/affected/0/versions"
},
{
"value": "7.66.0-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "7.67.0-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.1",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.2",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.4",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.5",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.6",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.7",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.10",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.11",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.12",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.13",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.14",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.15",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.16",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.18",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.19",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.20",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.21",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.22",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.23",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.24",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.25",
"evidence": "/affected/0/versions"
},
{
"value": "7.68.0-1ubuntu2.25+esm2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "curl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.81.0-1ubuntu1.23",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "7.74.0-1.3ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "7.74.0-1.3ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "7.80.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.1",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.2",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.3",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.4",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.6",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.7",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.8",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.10",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.11",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.13",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.14",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.15",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.16",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.17",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.18",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.19",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.20",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.21",
"evidence": "/affected/1/versions"
},
{
"value": "7.81.0-1ubuntu1.22",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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"fixed_versions": [
{
"value": "8.5.0-2ubuntu10.8",
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],
"affected_versions": [
{
"value": "8.2.1-1ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "8.2.1-1ubuntu3.1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.0-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu8",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu9",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.1",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.2",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.3",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.4",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.5",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.6",
"evidence": "/affected/2/versions"
},
{
"value": "8.5.0-2ubuntu10.7",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "curl",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.14.1-2ubuntu1.2",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "8.12.1-3ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "8.13.0-5ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "8.14.1-1ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "8.14.1-1ubuntu3",
"evidence": "/affected/3/versions"
},
{
"value": "8.14.1-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "8.14.1-2ubuntu1.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "curl",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.18.0-1ubuntu2",
"evidence": "/affected/4/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "curl",
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{
"value": "8.18.0-1ubuntu2",
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],
"affected_versions": [
{
"value": "8.14.1-2ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "8.17.0-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "8.18.0-1ubuntu1",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-1965",
"aliases": [
"UBUNTU-CVE-2026-1965"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/curl?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
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"7.68.0-1ubuntu2.25+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1965.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl4",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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{
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]
}
],
"package": {
"name": "curl",
"purl": "pkg:deb/ubuntu/curl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"7.74.0-1.3ubuntu2",
"7.74.0-1.3ubuntu3",
"7.80.0-3",
"7.81.0-1",
"7.81.0-1ubuntu1.1",
"7.81.0-1ubuntu1.2",
"7.81.0-1ubuntu1.3",
"7.81.0-1ubuntu1.4",
"7.81.0-1ubuntu1.6",
"7.81.0-1ubuntu1.7",
"7.81.0-1ubuntu1.8",
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"7.81.0-1ubuntu1.11",
"7.81.0-1ubuntu1.13",
"7.81.0-1ubuntu1.14",
"7.81.0-1ubuntu1.15",
"7.81.0-1ubuntu1.16",
"7.81.0-1ubuntu1.17",
"7.81.0-1ubuntu1.18",
"7.81.0-1ubuntu1.19",
"7.81.0-1ubuntu1.20",
"7.81.0-1ubuntu1.21",
"7.81.0-1ubuntu1.22"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1965.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl4",
"binary_version": "7.81.0-1ubuntu1.23"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.0-2ubuntu10.8"
}
]
}
],
"package": {
"name": "curl",
"purl": "pkg:deb/ubuntu/curl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"8.2.1-1ubuntu3",
"8.2.1-1ubuntu3.1",
"8.4.0-2ubuntu1",
"8.5.0-2ubuntu1",
"8.5.0-2ubuntu2",
"8.5.0-2ubuntu8",
"8.5.0-2ubuntu9",
"8.5.0-2ubuntu10",
"8.5.0-2ubuntu10.1",
"8.5.0-2ubuntu10.2",
"8.5.0-2ubuntu10.3",
"8.5.0-2ubuntu10.4",
"8.5.0-2ubuntu10.5",
"8.5.0-2ubuntu10.6",
"8.5.0-2ubuntu10.7"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1965.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.5.0-2ubuntu10.8"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.5.0-2ubuntu10.8"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.5.0-2ubuntu10.8"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.14.1-2ubuntu1.2"
}
]
}
],
"package": {
"name": "curl",
"purl": "pkg:deb/ubuntu/curl?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"8.12.1-3ubuntu1",
"8.13.0-5ubuntu1",
"8.14.1-1ubuntu2",
"8.14.1-1ubuntu3",
"8.14.1-2ubuntu1",
"8.14.1-2ubuntu1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1965.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.14.1-2ubuntu1.2"
},
{
"binary_name": "libcurl3t64-gnutls",
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},
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"modified": "2026-10-17T12:59:54.492535187Z",
"provider": "osv",
"upstream": [
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],
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"https://ubuntu.com/security/CVE-2026-1965",
"https://www.cve.org/CVERecord?id=CVE-2026-1965",
"https://curl.se/docs/CVE-2026-1965.html",
"https://ubuntu.com/security/notices/USN-8084-1",
"https://ubuntu.com/security/notices/USN-8099-1"
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{
"value": "CVE-2026-1965",
"evidence": "/upstream"
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],
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},
"source_id": "core-osv",
"document_id": 359935,
"published_at": "2026-03-11T18:00:00+00:00"
}