CVE-2026-73197: Ipa: freeipa: unauthenticated dos in `/ipa/migration/migration.py` via unbounded request body read

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 29 Oct 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

0.5%

EPSS score, percentile 45.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

7.5 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (9)

Which versions are affected?

Unaffected 0:4.13.4-1.el10_2; 0:4.12.2-15.el10_0.7; 8100020261007071200.143e9e98; 8100020261007070536.823393f5; 8060020261008134123.c1533a64; 8060020261008133528.ada582f1; and 10 more

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 29 Oct 2026. About the data.

What to do

Workaround (from the CVE record)

If the `/ipa/migration` endpoint is not required, it can be disabled by commenting out or removing the `Alias /ipa/migration` and its corresponding `<Directory>` block in the Apache configuration file (e.g., `/etc/httpd/conf.d/ipa.conf`). Alternatively, to limit the size of request bodies processed by the `/ipa/migration` endpoint, add the `LimitRequestBody` directive within the `<Directory "/usr/share/ipa/migration">` block in your Apache configuration, setting a conservative limit such as 1 MiB (1048576 bytes): ```apache <Directory "/usr/share/ipa/migration"> LimitRequestBody 1048576 # ... other directives ... </Directory> ``` After modifying the Apache configuration, the `httpd` service must be reloaded or restarted for the changes to take effect. This may temporarily interrupt service.

Advisories and patches

• RHSA-2026:70564 (Vendor advisory)
• RHSA-2026:72279 (Vendor advisory)
• RHSA-2026:82935 (Vendor advisory)
• RHSA-2026:83083 (Vendor advisory)
• RHSA-2026:83084 (Vendor advisory)
• RHSA-2026:83085 (Vendor advisory)
• RHSA-2026:83460 (Vendor advisory)
• RHSA-2026:83461 (Vendor advisory)
• RHSA-2026:89836 (Vendor advisory)

This summary is based on the CVE record as of 29 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: unknown.

Versions not listed are: affected.

Versions the record lists as unaffected: 0:4.13.4-1.el10_2, 0:4.12.2-15.el10_0.7, 8100020261007071200.143e9e98, 8100020261007070536.823393f5, 8060020261008134123.c1533a64, 8060020261008133528.ada582f1, 8080020261007080925.e581a9e4, 8080020261007071832.b0a6ceea.

Source: CVE List, as of 29 Oct 2026. About the data.

About this vulnerability

A flaw was found in FreeIPA. A remote, unauthenticated attacker can exploit this vulnerability by sending oversized form POST requests to the `/ipa/migration/migration.py` endpoint. This can force the migration handler to read attacker-controlled request bodies fully into memory, leading to increased memory usage, slower request handling, and potential service disruption or denial of service.

Summary: CVE record, as of 29 Oct 2026.

• CISA has not added CVE-2026-73197 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
• The CVE record was published on 20 Aug 2026.
• The CVE record carries a CVSS v3.1 base score of 7.5 (High), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.5% (percentile 45.3), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
• CISA's SSVC assessment in the CVE record: exploitation none, automatable yes, technical impact partial.
• The credits in the CVE record name AISLE as finder.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; CVE List, as of 29 Oct 2026; FIRST EPSS, as of 29 Oct 2026. About the data.

Description

Ipa: freeipa: unauthenticated dos in `/ipa/migration/migration.py` via unbounded request body read

A flaw was found in FreeIPA. A remote, unauthenticated attacker can exploit this vulnerability by sending oversized form POST requests to the `/ipa/migration/migration.py` endpoint. This can force the migration handler to read attacker-controlled request bodies fully into memory, leading to increased memory usage, slower request handling, and potential service disruption or denial of service.

Source: CVE List, as of 29 Oct 2026. About the data.

Timeline

Known exploited Red Hat vulnerabilities

• CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added 26 Aug 2026)
• CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added 26 Aug 2026)
• CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added 28 Sep 2023)
• CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added 12 May 2023)
• CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added 27 Jun 2022)