CVE-2026-14612
MediumCVSS 4.2Summary
Two off-by-one errors in the FreeIPA ipa-otpd daemon's OAuth2 device authorization handler can cause out-of-bounds memory access when processing an oversized response from a configured external OAuth2/OIDC Identity Provider. An attacker controlling or man-in-the-middling the IdP endpoint may trigger ipa-otpd to write or read one byte past the end of a fixed-size buffer.
Risk Assessment
The primary risk for the organization is a limited denial of service affecting the ipa-otpd daemon, potentially disrupting OAuth2 authentication services. Exploitation requires FreeIPA configured with an external IdP and a user initiating the OAuth2 device authorization flow.
Recommendation
Immediately update FreeIPA to a patched version that fixes the off-by-one errors. Until the update is applied, limit trust in external OAuth2/OIDC providers and monitor network traffic to those providers.
Original NVD description (English source)
Two off-by-one errors in the FreeIPA ipa-otpd daemon's OAuth2 device authorization handler can cause out-of-bounds memory access when processing an oversized response from a configured external OAuth2/OIDC Identity Provider. An attacker who controls or can man-in-the-middle the IdP endpoint may be able to trigger ipa-otpd to write or read one byte past the end of a fixed-size buffer. Exploitation requires FreeIPA to be configured with an external IdP, attacker control or MITM of that IdP, and a user to initiate the OAuth2 device authorization flow. The most likely impact is limited denial of service affecting the ipa-otpd daemon.