CVE-2025-59088

Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv

State: Published
Severity: 8.6 High
Published: Nov 12, 2025
Updated: Jun 30, 2026
Reserved: Sep 8, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	redhat

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
kdcproxylatchset	before 1.1.0Affected
Red Hat Enterprise Linux 10Red Hat	0:1.0.0-19.el10_1 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:1.0.0-19.el10_0 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:0.3.2-3.el7_9.3 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	8100020251103113748.143e9e98 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	8100020251028161822.823393f5 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	8020020251106022345.792f4060 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	8040020251103205102.5b01ab7e and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	8040020251103205102.5b01ab7e and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	8060020251030180424.ada582f1 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	8060020251030180424.ada582f1 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	8060020251030180424.ada582f1 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	8080020251029082621.b0a6ceea and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	8080020251029082621.b0a6ceea and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.0.0-9.el9_7 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.0.0-7.el9_0.1 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.0.0-7.el9_2.1 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:1.0.0-7.el9_4.1 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.0.0-9.el9_6 and laterNot affected

References

RHSA-2025:21138vendor-advisory
RHSA-2025:21139vendor-advisory
RHSA-2025:21140vendor-advisory
RHSA-2025:21141vendor-advisory
RHSA-2025:21142vendor-advisory
RHSA-2025:21448vendor-advisory
RHSA-2025:21748vendor-advisory
RHSA-2025:21806vendor-advisory
RHSA-2025:21818vendor-advisory
RHSA-2025:21819vendor-advisory
RHSA-2025:21820vendor-advisory
RHSA-2025:21821vendor-advisory
RHSA-2025:22982vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-59088vdb-entry
RHBZ#2393955issue-tracking
https://github.com/latchset/kdcproxy/pull/68

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