5

CVE-2026-11791

389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()

A flaw was found in 389 Directory Server. During schema reload, the attr_syntax_swap_ht() function unconditionally frees attribute syntax information nodes, bypassing the refcount-based deferred deletion used elsewhere in the attribute syntax subsystem. If an administrator triggers schema reload while concurrent LDAP query traffic is active, worker threads may access freed memory, resulting in use-after-free or double-free and a denial of service (server crash).
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Redhat ≫ Directory Server Version 11.0
Redhat ≫ Directory Server Version 12.0
Redhat ≫ Directory Server Version 13.0
Redhat ≫ Enterprise Linux Version 7.0
Redhat ≫ Enterprise Linux Version 8.0
Redhat ≫ Enterprise Linux Version 9.0
Redhat ≫ Enterprise Linux Version 10.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.21% 0.115
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5 0.7 4.2
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
RedHat 5 0.7 4.2
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://access.redhat.com/security/cve/CVE-2026-11791
Vendor Advisory
Mitigation
https://bugzilla.redhat.com/show_bug.cgi?id=2485414
Vendor Advisory
Issue Tracking