What’s Vulnerable › Vulnerabilities

CVE-2026-12528: 389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__normalize_acltxt()

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-17 · updated 2026-06-28
• Weakness: CWE-787

Description

A flaw was found in 389 Directory Server in the __aclp__normalize_acltxt() function of aclparse.c. A malformed ACI (Access Control Instruction) string can trigger heap-buffer-overflow writes and reads during ACI parsing. The function fails to validate that the ACI keyword has sufficient length after whitespace stripping, leading to a 1-byte out-of-bounds write and subsequent out-of-bounds reads. An authenticated user with write access to the aci attribute could send a crafted ACI value to silently corrupt heap memory in the directory server process.

Affected products

• Red Hat 389 Directory Server: all versions
• RedHat Directory Server: 11.0, 12.0, 13.0
• Red Hat Enterprise Linux: 7.0, 8.0, 9.0, 10.0

References

• https://access.redhat.com/security/cve/CVE-2026-12528
• https://bugzilla.redhat.com/show_bug.cgi?id=2489835
• https://github.com/389ds/389-ds-base/pull/7542

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