CVE-2025-59088 Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv
An attacker can exploit unauthenticated SSRF in Python-kdcproxy to probe internal networks and exfiltrate data via DNS SRV records.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59088?
CVE-2025-59088 is a high-severity server-side request forgery vulnerability in Red Hat Enterprise Linux 10, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2025-59088?
How do I fix CVE-2025-59088?
Apply the vendor's patch.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2025-59088 being exploited?
There is no known exploitation of CVE-2025-59088 in the wild and no public exploit code.
Sources
Also known as AZL-70174, AZL-70184, DEBIAN-CVE-2025-59088, GHSA-crfg-8xhr-7q4w, UBUNTU-CVE-2025-59088.