CVE-2026-12528
mediumpriority · track · 22EPSS 0.002 · 13 %ileEUUSEPSS · scored 2026-10-23
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/CVE-2026-12528cnnvd
- https://access.redhat.com/security/cve/cve-2026-12528Patchcnnvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2489835cnnvd
- https://github.com/389ds/389-ds-base/pull/7542cnnvd
- https://access.redhat.com/security/cve/CVE-2026-12528enisa_euvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2489835enisa_euvd
- https://github.com/389ds/389-ds-base/pull/7542enisa_euvd
- https://access.redhat.com/security/cve/CVE-2026-12528Vendor Advisorynvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan