CVE-2026-73198: Ipa: freeipa: unauthenticated dos in `/ipa/i18n_messages` 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)

To mitigate this issue, configure Apache to enforce a request-body limit for the `/ipa/i18n_messages` endpoint. This can be achieved by adding `LimitRequestBody` directive within the Apache configuration for IPA. For example, to limit the request body to 1MB, add `LimitRequestBody 1048576` to the relevant `<Location "/ipa/i18n_messages">` block or a broader `/ipa/*` location. A restart of the Apache HTTP Server (`httpd`) service is required for the changes to take effect, which may temporarily impact FreeIPA service availability. If a reverse proxy or load balancer is used, ensure it also enforces an equivalent body-size limit.

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: unaffected.

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 a vulnerability in the `/ipa/i18n_messages` endpoint by sending an arbitrarily large request body. This can cause the service to consume excessive memory, leading to memory exhaustion, degraded responsiveness, and a denial of service (DoS) condition.

Summary: CVE record, as of 29 Oct 2026.

• CISA has not added CVE-2026-73198 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/i18n_messages` via unbounded request body read

A flaw was found in FreeIPA. A remote, unauthenticated attacker can exploit a vulnerability in the `/ipa/i18n_messages` endpoint by sending an arbitrarily large request body. This can cause the service to consume excessive memory, leading to memory exhaustion, degraded responsiveness, and a denial of service (DoS) condition.

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)