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8.8 High

CVE-2026-11610 389-ds-base: 389-ds-base: heap buffer overflow in sasl_io_recv() via padded sasl unbind

Description

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 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitable remotely over the network, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
Low
Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Directory Server 11 Versions not published
Red Hat Directory Server 12 Versions not published
Red Hat Directory Server 13 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 8100020260626120929.25 earliest → < 8100020260626120929.25e700aa 8100020260626120929.25e700aa
Red Hat Enterprise Linux 9 Versions not published
Red Hat Directory Server 11.5 E4S for RHEL 8 8060020260702180044.0 earliest → < 8060020260702180044.0ca98e7e 8060020260702180044.0ca98e7e
Show the 17 other branches
Product Affected versions Fixed in
Red Hat Directory Server 11.7 E4S for RHEL 8 8080020260702180836 earliest → < 8080020260702180836.f969626e 8080020260702180836.f969626e
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020260630025241.6 earliest → < 8080020260630025241.6dbb3803 8080020260630025241.6dbb3803
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020260630025241.6 earliest → < 8080020260630025241.6dbb3803 8080020260630025241.6dbb3803
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support Versions not published
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020260629123121.96015 earliest → < 8040020260629123121.96015a92 8040020260629123121.96015a92
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020260629123121.96015 earliest → < 8040020260629123121.96015a92 8040020260629123121.96015a92
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020260626130540.824 earliest → < 8060020260626130540.824efc52 8060020260626130540.824efc52
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020260626130540.824 earliest → < 8060020260626130540.824efc52 8060020260626130540.824efc52
Red Hat Directory Server 11.9 for RHEL 8 8100020260702145313.37 earliest → < 8100020260702145313.37ed7c03 8100020260702145313.37ed7c03
Red Hat Directory Server 12.4 E4S for RHEL 9 9040020260703055735.1674 earliest → < 9040020260703055735.1674d574 9040020260703055735.1674d574
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Directory Server 13.2 1783452100 earliest → < 1783452100 1783452100
Red Hat Directory Server 12.2 E4S for RHEL 9 9020020260703060155.1674 earliest → < 9020020260703060155.1674d574 9020020260703060155.1674d574
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published
389-ds-base 1.3 1.3.2 → 3.3.0 No fix stated

References

Timeline

  1. Published
  2. Last modified

Other CVEs of Red Hat Directory Server 11

The 42 CVEs of Red Hat Directory Server 11 →
CVE-2026-117548 389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schema alias name causes denial of service 6.5 Medium CVE-2026-86345 389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result 9.0 Critical CVE-2026-86344 389-ds-base: 389-ds-base: unauthenticated worker-thread-pool exhaustion via completed-operation-then-incomplete-pdu connection requeue 7.5 High CVE-2026-19843 389-ds-base: 389-ds-base: command injection via unescaped ldap dn in cockpit 389 console ldap editor 8.4 High
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