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CVE-2026-11774

389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflow PUBLISHED

Description (CNA)

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat Directory Server 11.5 E4S for RHEL 8unaffected 8060020260702180044.0ca98e7e before *
Red Hat / Red Hat Directory Server 11.7 E4S for RHEL 8unaffected 8080020260702180836.f969626e before *
Red Hat / Red Hat Directory Server 11.9 for RHEL 8unaffected 8100020260702145313.37ed7c03 before *
Red Hat / Red Hat Directory Server 12.2 E4S for RHEL 9unaffected 9020020260703060155.1674d574 before *
Red Hat / Red Hat Directory Server 12.4 E4S for RHEL 9unaffected 9040020260703055735.1674d574 before *
Red Hat / Red Hat Enterprise Linux 10unaffected 0:3.2.0-8.el10_2 before *
Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Supportunaffected 0:3.0.6-19.el10_0 before *
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:1.3.11.1-13.el7_9 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 8100020260626120929.25e700aa before *
Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 8040020260629123121.96015a92 before *
Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 8040020260629123121.96015a92 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 8060020260626130540.824efc52 before *
Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onunaffected 8060020260626130540.824efc52 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 8080020260630025241.6dbb3803 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 8080020260630025241.6dbb3803 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:2.8.0-8.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:2.2.4-19.el9_2 before *
Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutionsunaffected 0:2.4.5-26.el9_4 before *
Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Supportunaffected 0:2.6.1-22.el9_6 before *
Red Hat / Red Hat Directory Server 13.2unaffected 1783452100 before *
Red Hat / Red Hat Directory Server 12affected
Red Hat / Red Hat Directory Server 13unaffected
Red Hat / Red Hat Enterprise Linux 6unaffected

CWE

CWE-190

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.