Bug 2499961 (CVE-2026-15722)

Summary:	CVE-2026-15722 389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica ID parsing
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aadhikar, bsmejkal, jachapma, mreynolds, progier, rhel-process-autobot, security-response-team, snegrini, spichugi, tbordaz, vashirov, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	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.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2509730
Bug Blocks:
Deadline:	2026-07-31

Description OSIDB Bzimport 2026-07-14 12:56:37 UTC

A flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in ldap/servers/plugins/replication/repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer (ridbuff[RIDSTR_SIZE]) without bounds checking the loop counter. A remote unauthenticated attacker can crash the ns-slapd process by sending a crafted StartNSDS50ReplicationRequest LDAP extended operation (OID 2.16.840.1.113730.3.5.12) containing more than 16 consecutive digit characters in the replica ID field. The overflow occurs during payload decoding in decode_startrepl_extop(), before the replica_is_updatedn() authorization check runs, making it exploitable without credentials on default configurations where anonymous access is enabled. On production builds with stack protectors, the impact is limited to denial of service (process abort). The vulnerable code path is: decode_startrepl_extop() -> decode_ruv() -> ruv_init_from_bervals() -> get_ruvelement_from_berval().