ALAS2-2026-3926

Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3926
Advisory Released Date: 2026-09-28
Advisory Updated Date: 2026-09-28
Severity: Important
Issue Overview:

A flaw was found in 389 Directory Server. An unauthenticated remote attacker can inject LDAP search filters into the CleanAllRUV replication status-check extended operation. Because the handler performs the search against cn=config with elevated replication plugin privileges and returns a boolean match result, the attacker can extract sensitive server configuration metadata, including replication bind DNs and password storage scheme information. (CVE-2026-11770)

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to denial of service. (CVE-2026-15722)


Affected Packages:

389-ds-base


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 389-ds-base or yum update --advisory ALAS2-2026-3926 to update your system.

New Packages:
aarch64:
    389-ds-base-1.3.10.2-17.amzn2.0.11.aarch64
    389-ds-base-libs-1.3.10.2-17.amzn2.0.11.aarch64
    389-ds-base-devel-1.3.10.2-17.amzn2.0.11.aarch64
    389-ds-base-snmp-1.3.10.2-17.amzn2.0.11.aarch64
    389-ds-base-debuginfo-1.3.10.2-17.amzn2.0.11.aarch64

i686:
    389-ds-base-1.3.10.2-17.amzn2.0.11.i686
    389-ds-base-libs-1.3.10.2-17.amzn2.0.11.i686
    389-ds-base-devel-1.3.10.2-17.amzn2.0.11.i686
    389-ds-base-snmp-1.3.10.2-17.amzn2.0.11.i686
    389-ds-base-debuginfo-1.3.10.2-17.amzn2.0.11.i686

src:
    389-ds-base-1.3.10.2-17.amzn2.0.11.src

x86_64:
    389-ds-base-1.3.10.2-17.amzn2.0.11.x86_64
    389-ds-base-libs-1.3.10.2-17.amzn2.0.11.x86_64
    389-ds-base-devel-1.3.10.2-17.amzn2.0.11.x86_64
    389-ds-base-snmp-1.3.10.2-17.amzn2.0.11.x86_64
    389-ds-base-debuginfo-1.3.10.2-17.amzn2.0.11.x86_64

Additional References

Red Hat: CVE-2026-11770, CVE-2026-15722

Mitre: CVE-2026-11770, CVE-2026-15722