Medium [CVE-2026-73196] Authenticated DoS in `otptoken-add` via unbounded OTP key decoding/re-encoding
This medium-severity Red Hat Linux advisory covers CVE-2026-73196 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
A flaw was found in FreeIPA. A low-privilege authenticated user can exploit this vulnerability by submitting an oversized One-Time Password (OTP) key value.
This oversized key is then decoded and re-encoded without proper size limits, consuming excessive CPU and memory resources. This can lead to a denial of service, degrading the availability of the IPA service.
Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-770.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: ipa.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To mitigate this issue, enforce conservative HTTP request-body limits on the `/ipa/session/json` endpoint to reject oversized payloads before they reach the vulnerable IPA parameter conversion. Additionally, if operationally feasible, restrict self-managed token creation to trusted users and implement monitoring or rate-limiting for repeated large authenticated requests. Changes to HTTP server configurations or FreeIPA permissions may require service restarts or reloads to take effect.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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