CVE-2026-16560 389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued rdn
A heap-buffer-overflow in 389-ds-base allows attackers to cause denial of service or arbitrary memory writes via crafted DN values.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16560?
CVE-2026-16560 is a medium-severity memory corruption vulnerability in Red Hat Directory Server 11, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A heap-buffer-overflow flaw was found in Directory Server (389-ds-base). When a DN contains a legacy-quoted value, the server won't close the heap allocation allowing another call to refer to the same memory pointer causing a denial of service or an arbitrary memory write operation.
Weakness: CWE-1220
Which versions are affected by CVE-2026-16560?
How do I fix CVE-2026-16560?
No fix has been published for CVE-2026-16560 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-16560 being exploited?
There is no known exploitation of CVE-2026-16560 in the wild and no public exploit code.
Sources
Also known as AZL-93072, DEBIAN-CVE-2026-16560, GHSA-cwj4-7fp9-r4jg, UBUNTU-CVE-2026-16560.