HighFix available
curl — security advisory
A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.
- Products
- curl
- Affected versions
- 8.14.1-2ubuntu1, 8.17.0-1ubuntu1, 8.18.0-1ubuntu1, 8.18.0-1ubuntu2, 8.18.0-1ubuntu2.1, 8.18.0-1ubuntu2.2, 8.18.0-1ubuntu2.3, 8.18.0-1ubuntu2.4, 8.18.0-1ubuntu2.5, 8.2.1-1ubuntu3, 8.2.1-1ubuntu3.1, 8.20.0-2ubuntu1, 8.20.0-2ubuntu10, 8.20.0-2ubuntu3, 8.4.0-2ubuntu1, 8.5.0-2ubuntu1, 8.5.0-2ubuntu10, 8.5.0-2ubuntu10.1, 8.5.0-2ubuntu10.10, 8.5.0-2ubuntu10.11, 8.5.0-2ubuntu10.12, 8.5.0-2ubuntu10.13, 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, 8.5.0-2ubuntu10.8, 8.5.0-2ubuntu10.9, 8.5.0-2ubuntu2, 8.5.0-2ubuntu8, 8.5.0-2ubuntu9
- Fixed versions
- 8.18.0-1ubuntu2.7, 8.20.0-2ubuntu11, 8.5.0-2ubuntu10.15
- CVEs
- CVE-2026-13608
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:41 UTC · Revision 1
Source evidence
A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.
osv:UBUNTU-CVE-2026-13608
curl
Fixed versions: 8.5.0-2ubuntu10.15
curl
Fixed versions: 8.20.0-2ubuntu11
curl
Fixed versions: 8.18.0-1ubuntu2.7
Complete source record
{
"id": "dc5d09e0480fed6b8d3663625d9e08974194330893c447ec977dae9a38566767",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-13608",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-13608",
"summary": "A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.",
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{
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{
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{
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{
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{
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"affected_versions": [
{
"value": "8.14.1-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "8.17.0-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "8.18.0-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "8.18.0-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "8.18.0-1ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"value": "8.18.0-1ubuntu2.2",
"evidence": "/affected/2/versions"
},
{
"value": "8.18.0-1ubuntu2.3",
"evidence": "/affected/2/versions"
},
{
"value": "8.18.0-1ubuntu2.4",
"evidence": "/affected/2/versions"
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{
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],
"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
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"8.5.0-2ubuntu8",
"8.5.0-2ubuntu9",
"8.5.0-2ubuntu10",
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"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",
"8.5.0-2ubuntu10.8",
"8.5.0-2ubuntu10.9",
"8.5.0-2ubuntu10.10",
"8.5.0-2ubuntu10.11",
"8.5.0-2ubuntu10.12",
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13608.json"
},
"ecosystem_specific": {
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{
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{
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{
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{
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"modified": "2026-10-17T12:58:46.103761370Z",
"provider": "osv",
"upstream": [
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"references": [
"https://ubuntu.com/security/CVE-2026-13608",
"https://www.cve.org/CVERecord?id=CVE-2026-13608",
"https://curl.se/docs/CVE-2026-13608.html",
"https://github.com/curl/curl/commit/ea71c3b6b60e563651ea8596a9",
"https://ubuntu.com/security/notices/USN-8820-1"
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"source_id": "core-osv",
"document_id": 359030,
"published_at": "2026-09-06T18:17:00+00:00"
}