Description
A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password verification function uses standard memcmp() for comparing password hashes instead of a constant-time comparison function. A remote attacker could potentially use timing measurements of LDAP bind attempts to infer partial hash information, though practical exploitation is extremely difficult due to PBKDF2 computational overhead.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11 | — | — |
| Red Hat | Red Hat Directory Server 12 | — | — |
| Red Hat | Red Hat Directory Server 13 | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | 389-ds-base | No fix yet | — |
| Debian 12 | 389-ds-base | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | 389-ds-base | No fix yet | — |
| Ubuntu 26.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu 25.10 | 389-ds-base | No fix yet | — |
| Ubuntu 24.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu 22.04 LTS | 389-ds-base | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu Pro 18.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu Pro 16.04 LTS | 389-ds-base | No fix yet | — |
References
- https://access.redhat.com/security/cve/CVE-2026-15041 vdb-entry
- RHBZ#2498022 issue-tracking