Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-4008
Advisory Released Date: 2026-10-24
Advisory Updated Date: 2026-10-26
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. (CVE-2026-73196)
A flaw was found in the `ipa-enrollment` SLAPI plugin. A remote authenticated client can exploit a null pointer dereference vulnerability by sending a malformed Lightweight Directory Access Protocol (LDAP) extended operation. By omitting the request value for the `JOIN_OID` in the `ipa-enrollment` extended operation, an attacker can trigger a server crash, potentially causing a denial of service. (CVE-2026-73199)
Affected Packages:
ipa
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update ipa or yum update --advisory ALAS2-2026-4008 to update your system.
aarch64:
ipa-server-4.6.8-5.amzn2.17.10.aarch64
ipa-server-trust-ad-4.6.8-5.amzn2.17.10.aarch64
ipa-client-4.6.8-5.amzn2.17.10.aarch64
ipa-debuginfo-4.6.8-5.amzn2.17.10.aarch64
i686:
ipa-server-4.6.8-5.amzn2.17.10.i686
ipa-server-trust-ad-4.6.8-5.amzn2.17.10.i686
ipa-client-4.6.8-5.amzn2.17.10.i686
ipa-debuginfo-4.6.8-5.amzn2.17.10.i686
noarch:
python2-ipaserver-4.6.8-5.amzn2.17.10.noarch
ipa-server-common-4.6.8-5.amzn2.17.10.noarch
ipa-server-dns-4.6.8-5.amzn2.17.10.noarch
python2-ipaclient-4.6.8-5.amzn2.17.10.noarch
ipa-client-common-4.6.8-5.amzn2.17.10.noarch
ipa-python-compat-4.6.8-5.amzn2.17.10.noarch
python2-ipalib-4.6.8-5.amzn2.17.10.noarch
ipa-common-4.6.8-5.amzn2.17.10.noarch
src:
ipa-4.6.8-5.amzn2.17.10.src
x86_64:
ipa-server-4.6.8-5.amzn2.17.10.x86_64
ipa-server-trust-ad-4.6.8-5.amzn2.17.10.x86_64
ipa-client-4.6.8-5.amzn2.17.10.x86_64
ipa-debuginfo-4.6.8-5.amzn2.17.10.x86_64