High
python-kdcproxy — security advisory
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
- python-kdcproxy
- Affected versions
- 0.3.2-1, 0.3.2-5, 0.4-1, 0.4.2-1, 1.0.0-1, 1.0.0-2, 1.0.0-2build1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-59088
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:39 UTC · Revision 1
Source evidence
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:UBUNTU-CVE-2025-59088
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
python-kdcproxy
Fixed versions: Not specified
Complete source record
{
"id": "e3060f661872f3a6efb54b07c041b6efc4c724e0219bf52d6a67adc95d4bdb72",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-59088",
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"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.",
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"modified": "2026-10-17T12:55:55.057105226Z",
"provider": "osv",
"upstream": [
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"references": [
"https://ubuntu.com/security/CVE-2025-59088",
"https://www.cve.org/CVERecord?id=CVE-2025-59088",
"https://github.com/latchset/kdcproxy/pull/68",
"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/security/cve/CVE-2025-59088"
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"source_id": "core-osv",
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"published_at": "2025-11-12T17:15:00+00:00"
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