Bug 2485425 (CVE-2026-11787)

Summary: CVE-2026-11787 389-ds-base: 389-ds-base: heap buffer over-read in ldap_utf8prev() via str2simple filter parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: POST --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aadhikar, bsmejkal, jachapma, mreynolds, progier, rhel-process-autobot, snegrini, spichugi, tbordaz, vashirov, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2494774    
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Description OSIDB Bzimport 2026-06-05 12:25:17 UTC 
The ldap_utf8prev() function in 389 Directory Server unconditionally reads up to 6 bytes before a heap allocation because it lacks a lower-bound parameter. This API design flaw has existed since the Mozilla LDAP C SDK import and was symptomatically patched twice without fixing the root cause. Twenty call sites remain vulnerable to 1-6 byte heap over-reads.

Cannot be triggered via standard LDAP wire protocol (BER filters parsed separately), but internal callers processing attacker-influenced data (plugin configuration, ACI definitions, replication) are affected. ASan confirmed on aarch64; no crash on production binaries.