CVE-2026-11610High· 8.8▾ TwilightA heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). After a successful SASL bind with integrity protection (SSF > 0), an authenticated attacker can send a specially crafted oversized LDAP UN…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). After a successful SASL bind with integrity protection (SSF > 0), an authenticated attacker can send a specially crafted oversized LDAP UNBIND packet that is copied into a 512-byte heap receive buffer without a bounds check in sasl_io_recv() in sasl_io.c. This allows up to approximately 2 megabytes of attacker-controlled data to overflow the buffer, causing a denial of service (server crash). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, any enrolled host, or any service account can trigger this vulnerability over the network after authenticating via GSSAPI. The vulnerable code path has existed since approximately 2013 (389-ds-base 1.3.2) and was not addressed by the CVE-2025-14905 fix, which patched a separate heap overflow in schema.c only.
389-ds-base >= 1.3.2 <= 3.3.0redhat-ds:11 (all versions)redhat-ds:11 (all versions)redhat-ds:11 (all versions)redhat-ds:12 (all versions)redhat-ds:12 (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds-base (all versions)dirsrv/dirsrv-container-rhel10 (all versions)redhat-ds:12/389-ds-base (all versions)389-ds-base389-ds-base (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
There is no complete workaround for this flaw. Mitigations that reduce exposure:
Connected by shared product, vendor, weakness, or advisory.
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