Out-of-bounds Write Affecting 389ds/389-ds-base package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 Jun 2026
- disclosed3 Jun 2026
- creditUnknown
Introduced: 3 Jun 2026
CVE-2026-12528 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the __aclp__normalize_acltxt function when parsing a specially crafted Access Control Instruction string. An attacker can cause silent heap memory corruption by submitting a malformed value to the aci attribute. This is only exploitable if authenticated users have write access to the aci attribute, which may occur in older deployments or with custom ACI patterns that grant broader permissions.
Workaround
This vulnerability can be mitigated by restricting write access to the aci attribute to highly privileged accounts and reviewing ACIs for overly broad targetattr rules. The 389 DS ACI linting tool (lib389) can help identify such misconfigurations.