Skip to content
Fencer Vulns
high 8.6

CVE-2025-59088 json

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

published 2025-11-12 11 mo ago modified 2026-11-04 4 d ago also EUVD-2025-131921

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

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.

Patch / fix

  • latchset kdcproxy 1.1.0
  • Red Hat Red Hat Enterprise Linux 10 0:1.0.0-19.el10_1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.0.0-19.el10_0
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:0.3.2-3.el7_9.3
  • Red Hat Red Hat Enterprise Linux 8 8100020251028161822.823393f5, 8100020251103113748.143e9e98
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020251106022345.792f4060
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020251103205102.5b01ab7e
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020251103205102.5b01ab7e
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020251030180424.ada582f1
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020251030180424.ada582f1
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020251030180424.ada582f1
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020251029082621.b0a6ceea
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020251029082621.b0a6ceea
  • Red Hat Red Hat Enterprise Linux 9 0:1.0.0-9.el9_7
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:1.0.0-7.el9_0.1
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.0.0-7.el9_2.1
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:1.0.0-7.el9_4.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.0.0-9.el9_6
  • python-kdcproxy RHEL 10.1 1.0.0-19.el10_1
  • python3-kdcproxy RHEL 10.1 1.0.0-19.el10_1
  • ipa RHEL 8 4.9.13-20.module+el8.10.0+23617+3e211261
  • pyusb RHEL 8 1.0.0-9.1.module+el8.9.0+18920+2223d05e
  • softhsm RHEL 8 2.6.0-5.module+el8.9.0+18911+94941f82
  • custodia RHEL 8 0.6.0-3.module+el8.9.0+18911+94941f82
  • slapi-nis RHEL 8 0.60.0-4.module+el8.10.0+20723+03062ebd
  • ipa-client RHEL 8 4.9.13-20.module+el8.10.0+23617+3e211261

red hat advisories RHSA-2025:22982RHSA-2025:21821RHSA-2025:21819RHSA-2025:21820RHSA-2025:21818RHSA-2025:21806

  • softhsm AlmaLinux 8 2.6.0-5.module_el8.6.0+2881+2f24dc92
  • softhsm AlmaLinux 8 2.6.0-5.module_el8.6.0+3031+2f24dc92
  • custodia AlmaLinux 8 0.6.0-3.module_el8.6.0+2881+2f24dc92
  • slapi-nis AlmaLinux 8 0.60.0-4.module_el8.10.0+3844+20e075e5.alma.1
  • ipa-client AlmaLinux 8 4.9.13-21.module_el8.10.0+4302+2d2000af.3
  • ipa-common AlmaLinux 8 4.9.13-21.module_el8.10.0+4302+2d2000af.3
  • ipa-server AlmaLinux 8 4.9.13-21.module_el8.10.0+4302+2d2000af.3
  • opendnssec AlmaLinux 8 2.1.7-2.module_el8.10.0+3980+d78e8e90

almalinux advisories ALSA-2026:83460ALSA-2025:21139ALSA-2025:21140ALSA-2025:21142

  • ipa Rocky Linux 8 4.9.13-20.module+el8.10.0+2067+377bdd64
  • ipa Rocky Linux 8 4.9.13-20.module+el8.10.0+2066+d74ade98
  • pyusb Rocky Linux 8 1.0.0-9.1.module+el8.9.0+1372+09f67869
  • pyusb Rocky Linux 8 1.0.0-9.1.module+el8.9.0+1371+ffa84eb9
  • softhsm Rocky Linux 8 2.6.0-5.module+el8.9.0+1371+ffa84eb9
  • custodia Rocky Linux 8 0.6.0-3.module+el8.9.0+1371+ffa84eb9
  • slapi-nis Rocky Linux 8 0.60.0-4.module+el8.9.0+1573+39ab85f4
  • opendnssec Rocky Linux 8 2.1.7-2.module+el8.10.0+1960+1ed527b3

rocky linux advisories RLSA-2025:21140RLSA-2025:21142RLSA-2025:21139

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-59088 updated cvss 8.6

python-kdcproxy: Unauthenticated SSRF via Realm‑Controlled DNS SRV

  • Red Hat Enterprise Linux AppStream (v. 8) ipa 4.9.13-20.module+el8.10.0+23610+7d6e87e5, ipa 4.9.13-20.module+el8.10.0+23617+3e211261, pyusb 1.0.0-9.1.module+el8.9.0+18911+94941f82, pyusb 1.0.0-9.1.module+el8.9.0+18920+2223d05e, softhsm 2.6.0-5.module+el8.9.0+18911+94941f82, custodia 0.6.0-3.module+el8.9.0+18911+94941f82, +50 more
    fixed: vendor fix RHSA-2025:21140
  • Red Hat Enterprise Linux AppStream (v. 9) python-kdcproxy 1.0.0-9.el9_7, python3-kdcproxy 1.0.0-9.el9_7
    fixed: vendor fix RHSA-2025:21139
  • Red Hat Enterprise Linux AppStream (v. 10) python-kdcproxy 1.0.0-19.el10_1, python3-kdcproxy 1.0.0-19.el10_1
    fixed: vendor fix RHSA-2025:21142
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, softhsm 2.4.0-4.module+el8.2.0+5779+a38c524f, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, ipa 4.8.4-14.module+el8.2.0+23544+91c528c8.10, opendnssec 1.4.14-1.module+el8.1.0+4098+f286395e, slapi-nis 0.56.3-3.module+el8.2.0+10782+8facb0b2, +28 more
    fixed: vendor fix RHSA-2025:21821
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, ipa 4.9.2-10.module+el8.4.0+23621+13d4146a.4, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, python-qrcode 5.1-12.module+el8.1.0+4098+f286395e, +29 more
    fixed: vendor fix RHSA-2025:21820
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, ipa 4.9.8-13.module+el8.6.0+23614+ac2d171f.3, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, slapi-nis 0.60.0-1.module+el8.6.0+16878+6c033536, +29 more Red Hat Enterprise Linux AppStream E4S (v.8.6) pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, ipa 4.9.8-13.module+el8.6.0+23614+ac2d171f.3, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, slapi-nis 0.60.0-1.module+el8.6.0+16878+6c033536, +29 more
    fixed: vendor fix RHSA-2025:21819
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) custodia 0.6.0-3.module+el8.1.0+4098+f286395e, ipa 4.9.11-11.module+el8.8.0+23530+2673a519.3, pyusb 1.0.0-9.1.module+el8.7.0+15691+2b2c1dd5, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, slapi-nis 0.60.0-4.module+el8.8.0+20635+330e3683, +29 more
    fixed: vendor fix RHSA-2025:21818
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) python-kdcproxy 1.0.0-7.el9_0.1, python3-kdcproxy 1.0.0-7.el9_0.1
    fixed: vendor fix RHSA-2025:21806
show 8 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) python-kdcproxy 1.0.0-7.el9_2.1, python3-kdcproxy 1.0.0-7.el9_2.1
    fixed: vendor fix RHSA-2025:21448
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) python-kdcproxy 1.0.0-19.el10_0, python3-kdcproxy 1.0.0-19.el10_0
    fixed: vendor fix RHSA-2025:21141
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) python-kdcproxy 1.0.0-7.el9_4.1, python3-kdcproxy 1.0.0-7.el9_4.1
    fixed: vendor fix RHSA-2025:21748
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) python-kdcproxy 1.0.0-9.el9_6, python3-kdcproxy 1.0.0-9.el9_6
    fixed: vendor fix RHSA-2025:21138
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, ipa 4.9.2-10.module+el8.4.0+23621+13d4146a.4, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, python-qrcode 5.1-12.module+el8.1.0+4098+f286395e, +29 more
    fixed: vendor fix RHSA-2025:21820
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, ipa 4.9.8-13.module+el8.6.0+23614+ac2d171f.3, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, slapi-nis 0.60.0-1.module+el8.6.0+16878+6c033536, +29 more
    fixed: vendor fix RHSA-2025:21819
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) custodia 0.6.0-3.module+el8.1.0+4098+f286395e, ipa 4.9.11-11.module+el8.8.0+23530+2673a519.3, pyusb 1.0.0-9.1.module+el8.7.0+15691+2b2c1dd5, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, slapi-nis 0.60.0-4.module+el8.8.0+20635+330e3683, +29 more
    fixed: vendor fix RHSA-2025:21818
  • Red Hat Enterprise Linux Server (v. 7 ELS) python-kdcproxy 0.3.2-3.el7_9.3
    fixed: vendor fix RHSA-2025:22982

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

  • latchset kdcproxy
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.