Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv
If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where the "use_dns" setting is explicitly set to false are not affected.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-59088
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 08:26 UTC · Revision 1
Source evidence
Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv
core-osv · Original sourcePublished 12 Nov 2025, 16:35 UTC
If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where the "use_dns" setting is explicitly set to false are not affected.
osv:CVE-2025-59088
Complete source record
{
"id": "77aaec5a43d233bf5755daca6094076270c9f692072559b4c489d66634b468c0",
"url": "https://osv.dev/vulnerability/CVE-2025-59088",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv",
"summary": "If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where the \"use_dns\" setting is explicitly set to false are not affected.",
"evidence": "osv:CVE-2025-59088",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2025-59088",
"aliases": [
"CVE-2025-59088"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/latchset/kdcproxy",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "2d85bc6b6860a53327c4c51b072a1a6fd52730cd"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.1.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
}
],
"versions": [
"v1.0.0",
"v0.4.2",
"v0.4.1",
"v0.4",
"v0.3.3",
"v0.3.2",
"v0.3.1",
"v0.3",
"v0.2.1",
"v0.2",
"v0.1.1",
"v0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-59088.json"
}
}
],
"modified": "2026-10-28T02:30:27.472782884Z",
"provider": "osv",
"references": [
"https://access.redhat.com/downloads/content/package-browser/",
"https://access.redhat.com/errata/RHSA-2025:21138",
"https://access.redhat.com/errata/RHSA-2025:21139",
"https://access.redhat.com/errata/RHSA-2025:21140",
"https://access.redhat.com/errata/RHSA-2025:21141",
"https://access.redhat.com/errata/RHSA-2025:21142",
"https://access.redhat.com/errata/RHSA-2025:21448",
"https://access.redhat.com/errata/RHSA-2025:21748",
"https://access.redhat.com/errata/RHSA-2025:21806",
"https://access.redhat.com/errata/RHSA-2025:21818",
"https://access.redhat.com/errata/RHSA-2025:21819",
"https://access.redhat.com/errata/RHSA-2025:21820",
"https://access.redhat.com/errata/RHSA-2025:21821",
"https://access.redhat.com/errata/RHSA-2025:22982",
"https://access.redhat.com/security/cve/CVE-2025-59088",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/59xxx/CVE-2025-59088.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-59088",
"https://bugzilla.redhat.com/show_bug.cgi?id=2393955",
"https://github.com/latchset/kdcproxy/pull/68",
"https://github.com/latchset/kdcproxy"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "redhat",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "0:1.0.0-19.el10_1"
},
{
"fixed": "0:1.0.0-19.el10_0"
},
{
"fixed": "0:0.3.2-3.el7_9.3"
},
{
"fixed": "8100020251103113748.143e9e98"
},
{
"fixed": "8100020251028161822.823393f5"
},
{
"fixed": "8020020251106022345.792f4060"
},
{
"fixed": "8040020251103205102.5b01ab7e"
},
{
"fixed": "8040020251103205102.5b01ab7e"
},
{
"fixed": "8060020251030180424.ada582f1"
},
{
"fixed": "8060020251030180424.ada582f1"
},
{
"fixed": "8060020251030180424.ada582f1"
},
{
"fixed": "8080020251029082621.b0a6ceea"
},
{
"fixed": "8080020251029082621.b0a6ceea"
},
{
"fixed": "0:1.0.0-9.el9_7"
},
{
"fixed": "0:1.0.0-7.el9_0.1"
},
{
"fixed": "0:1.0.0-7.el9_2.1"
},
{
"fixed": "0:1.0.0-7.el9_4.1"
},
{
"fixed": "0:1.0.0-9.el9_6"
}
],
"source": "AFFECTED_FIELD",
"strategy": "InverseAffectedRanges"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/59xxx/CVE-2025-59088.json"
}
},
"related_cves": [
{
"value": "CVE-2025-59088",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493810,
"published_at": "2025-11-12T16:35:27.877+00:00"
}