389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval via unbounded replica id parsing
This high-severity Red Hat Linux advisory covers CVE-2026-15722 affecting Red Hat Directory Server 11, Red Hat Directory Server 12, Red Hat Enterprise Linux 10.
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Summary
A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking.
A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check.
Stack protectors limit impact to denial of service.
Affected products named by the advisory: Red Hat Directory Server 11; Red Hat Directory Server 12; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; and 2 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Stack protectors limit impact to denial of service.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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