CVE-2026-103885 Apache Directory LDAP API: Denial of service via crafted telephone number values
An attacker can cause indefinite CPU consumption in LDAP servers using this library by sending crafted telephone number 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-2026-103885?
CVE-2026-103885 is a high-severity denial of service vulnerability in Apache Directory LDAP API, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Asymmetric Resource Consumption vulnerability in Apache Directory LDAP API.
A LDAP server using the LDAP API (like Apache DS) may consume 100% of a CPU core indefinitely when processing some badly crafted Telephone Numbers.
This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9.
Users are recommended to upgrade to version 2.1.9, which fixes the issue.
Weakness: CWE-400
Which versions are affected by CVE-2026-103885?
How do I fix CVE-2026-103885?
No fix has been published for CVE-2026-103885 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-103885 being exploited?
There is no known exploitation of CVE-2026-103885 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-103885, GHSA-c2cq-mmh3-7wxh, UBUNTU-CVE-2026-103885.