A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). After a successful SASL bind with integrity protection (SSF > 0), an authenticated attacker can send a specially crafted oversized LDAP UNBIND packet that is copied into a 512-byte heap receive buffer without a bounds check in sasl_io_recv() in sasl_io.c. This allows up to approximately 2 megabytes of attacker-controlled data to overflow the buffer, causing a denial of service (server crash). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, any enrolled host, or any service account can trigger this vulnerability over the network after authenticating via GSSAPI. The vulnerable code path has existed since approximately 2013 (389-ds-base 1.3.2) and was not addressed by the CVE-2025-14905 fix, which patched a separate heap overflow in schema.c only.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade 389-ds-baseUpgrade 389-ds-base-legacy-toolsUpgrade 389-ds-base-develUpgrade python3-lib389Upgrade 389-ds-base-snmpUpgrade 389-ds-base-libs | Jul 8, 2026 | Jul 7, 2026 |
| Amazon Linux Ami 2 | — | Upgrade 389-ds-base-develUpgrade 389-ds-baseUpgrade 389-ds-base-libsUpgrade 389-ds-base-debuginfoUpgrade 389-ds-base-snmp | Aug 5, 2026 | Aug 5, 2026 |
| Redhat_linux | — | No solution existsUpgrade python3-lib389Upgrade 389-ds-base-legacy-toolsUpgrade 389-ds-base-libsUpgrade 389-ds-base-legacy-tools-debuginfoUpgrade 389-ds-base-develUpgrade 389-ds-base-debuginfoUpgrade 389-ds-base-bdbUpgrade 389-ds-base-snmpUpgrade 389-ds-base-debugsourceUpgrade 389-ds-baseUpgrade 389-ds-base-libs-debuginfoUpgrade 389-ds-base-bdb-debuginfoUpgrade 389-ds-base-snmp-debuginfo | Jul 14, 2026 | Jul 7, 2026 |
| Rocky_linux | — | Upgrade 389-ds-base-snmpUpgrade 389-ds-base-debugsourceUpgrade 389-ds-base-libs-debuginfoUpgrade 389-ds-base-bdbUpgrade 389-ds-base-bdb-debuginfoUpgrade 389-ds-baseUpgrade 389-ds-base-snmp-debuginfoUpgrade 389-ds-base-debuginfoUpgrade 389-ds-base-legacy-tools-debuginfoUpgrade 389-ds-base-libsUpgrade 389-ds-base-develUpgrade 389-ds-base-legacy-tools | Jul 10, 2026 | Jul 9, 2026 |
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