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.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-708e6b8e0c advisory.


        - Fixes: CVE-2026-14612 - potential buffer overflow in ipa-otpd

        - Fix potential buffer overvlow in ipa-join

        - Fix potential NUL pointer dereference in ipa-kdb


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-a1aaa5d134 advisory.

        - Fixes: CVE-2026-14612 - potential buffer overflow in ipa-otpd

        - Fix potential buffer overvlow in ipa-join

        - Fix potential NUL pointer dereference in ipa-kdb


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-14612)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
366734	Fedora 44 : freeipa (2026-708e6b8e0c)	Nessus	Fedora Local Security Checks	Local	medium
366726	Fedora 43 : freeipa (2026-a1aaa5d134)	Nessus	Fedora Local Security Checks	Local	medium
325064	Linux Distros Unpatched Vulnerability : CVE-2026-14612	Nessus	Misc.	Local	medium

Detections

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CVE-2026-14612

medium

Tenable Plugins

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medium