CVE-2026-73197 Ipa: freeipa: unauthenticated dos in `/ipa/migration/migration.py` via unbounded request body read
Unauthenticated attackers can cause denial of service in FreeIPA by sending oversized POST requests to the migration endpoint, exhausting server memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73197?
CVE-2026-73197 is a high-severity denial of service vulnerability in Redhat Enterprise Linux, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-73197?
It affects 2 products.
Products include Freeipa Freeipa, Redhat Enterprise Linux.
How do I fix CVE-2026-73197?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-73197 being exploited?
There is no known exploitation of CVE-2026-73197 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2015-5284 Information disclosure in n/a
- CVE-2026-11861 Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relationships
- CVE-2024-2698 Freeipa: delegation rules allow a proxy service to impersonate any user to access another target service
- CVE-2012-5631 Information disclosure in ipa
- CVE-2017-11191 Security feature bypass in n/a
Sources
Also known as DEBIAN-CVE-2026-73197, GHSA-m6vw-rcwj-pg9q, UBUNTU-CVE-2026-73197.