CVE-2026-16560
389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued rdn
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued rdn
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.
- Record
CVE-2026-16560- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-1220
- Updated
- 2026-11-05
EUVDEUVD-2026-47661
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.
- Record
EUVD-2026-47661- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-05
GitHub AdvisoriesGHSA-cwj4-7fp9-r4jg
A heap-buffer-overflow flaw was found in Directory Server (389-ds-base). When a DN contains a...
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.
- Record
GHSA-cwj4-7fp9-r4jg- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-1220
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-16560- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-1220
- Updated
- 2026-11-05
OSVDEBIAN-CVE-2026-16560
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.
- Record
DEBIAN-CVE-2026-16560- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-16560
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.
- Record
UBUNTU-CVE-2026-16560- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVAZL-93072 No score
CVE-2026-16560 affecting package 389-ds-base 3.1.1-12
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.
- Record
AZL-93072- Updated
- 2026-11-05
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
389-ds-baseAzure Linux:3 |
through 3.1.1-12 | None known |
389-ds-baseDebian:12 |
All versions, plus listed versions 2.3.1+dfsg1-12.3.1+dfsg1-1+deb12u12.3.4+dfsg1-12.3.4+dfsg1-1.12.4.4+dfsg1-1 Show 13 moreShow less2.4.4+dfsg1-32.4.5+dfsg1-13.0.2+dfsg1-13.1.1+dfsg1-13.1.1+dfsg1-23.1.1+dfsg1-33.1.2+dfsg1-13.1.2+vendor1-13.1.2+vendor1-23.3.0-13.3.0-23.3.1-13.3.1-3 |
None known |
389-ds-baseDebian:13 |
All versions, plus listed versions 3.1.2+dfsg1-13.1.2+dfsg1-1+deb13u13.1.2+vendor1-13.1.2+vendor1-23.3.0-13.3.0-23.3.1-13.3.1-3 |
None known |
389-ds-baseUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.3.3.12-1build11.3.3.13-11.3.4.5-21.3.4.8-11.3.4.8-3 Show 4 moreShow less1.3.4.8-3ubuntu11.3.4.8-41.3.4.9-11.3.4.9-1ubuntu0.1~esm1 |
None known |
389-ds-baseUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 1.3.7.5-11.3.7.5-1build11.3.7.5-1build21.3.7.9-11.3.7.10-11.3.7.10-1ubuntu11.3.7.10-1ubuntu1+esm1 |
None known |
389-ds-baseUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 1.4.1.6-41.4.1.6-4build11.4.2.4-11.4.2.4-1build11.4.3.2-11.4.3.2-1build11.4.3.6-21.4.3.6-2ubuntu0.1~esm1 |
None known |
389-ds-baseUbuntu:22.04:LTS |
All versions, plus listed versions 1.4.4.11-2build11.4.4.11-2build21.4.4.17-12.0.11-22.0.14-12.0.15-12.0.15-1ubuntu2 |
None known |
389-ds-baseUbuntu:24.04:LTS |
All versions, plus listed versions 2.3.4+dfsg1-12.4.4+dfsg1-1ubuntu12.4.4+dfsg1-1ubuntu42.4.4+dfsg1-32.4.5+dfsg1-1 |
None known |
389-ds-baseUbuntu:26.10 |
All versions, plus listed versions 3.1.2+vendor1-23.1.2+vendor1-2build13.3.1-3 |
None known |
389-ds-baseUbuntu:26.04:LTS |
All versions, plus listed versions 3.1.2+dfsg1-13.1.2+vendor1-2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-16560 is a medium vulnerability (CVSS 5.3) in Red Hat Directory Server 11, published July 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.