CVE.org (no NVD analysis yet)· CNA redhat

CVE-2026-86344: 389-ds-base: 389-ds-base: unauthenticated worker-thread-pool exhaustion via completed-operation-then-incomplete-pdu connection requeue

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.34% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: 389-ds (openSUSE:Tumbleweed) 3.3.1+28b6d8afc-1.1; 389-ds (SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS) 2.2.11~git12.1e612cde2-150500.3.54.1; 389-ds (SUSE:Linux Enterprise Server 15 SP6-LTSS) 2.2.11~git12.1e612cde2-150600.8.38.1.

Low priority for now. Upgrade to 389-ds (openSUSE:Tumbleweed) 3.3.1+28b6d8afc-1.1; 389-ds (SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS) 2.2.11~git12.1e612cde2-150500.3.54.1; 389-ds (SUSE:Linux Enterprise Server 15 SP6-LTSS) 2.2.11~git12.1e612cde2-150600.8.38.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection, causing the server to hand that connection to a second worker thread before the first worker's result is flushed. The second worker blocks until nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. Repeating this across a small number of connections proportional to the configured worker-thread pool size exhausts the entire pool under default configuration, denying service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the attacker maintains the connections.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Oct 1, 2026
Updated: Nov 5, 2026
EPSS: 0.3% · 28th percentile
CWE: CWE-400

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · redhat: 7.5; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

Red Hat Red Hat Directory Server 11
- all versionsaffected
- all versionsaffected
Red Hat Red Hat Directory Server 12
- all versionsaffected
- all versionsaffected
Red Hat Red Hat Directory Server 13
- all versionsaffected
Red Hat Red Hat Enterprise Linux 10
- all versionsaffected
Red Hat Red Hat Enterprise Linux 6
- all versionsunknown
Red Hat Red Hat Enterprise Linux 7
- all versionsunknown
Red Hat Red Hat Enterprise Linux 8
- all versionsaffected
- all versionsaffected
Red Hat Red Hat Enterprise Linux 9
- all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	389-ds-base	from 0	—
openSUSE:Tumbleweed	389-ds	before 3.3.1+28b6d8afc-1.1	3.3.1+28b6d8afc-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS	389-ds	before 2.2.11~git12.1e612cde2-150500.3.54.1	2.2.11~git12.1e612cde2-150500.3.54.1
SUSE:Linux Enterprise Server 15 SP6-LTSS	389-ds	before 2.2.11~git12.1e612cde2-150600.8.38.1	2.2.11~git12.1e612cde2-150600.8.38.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

CVE-2026-86345389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result
36Monitor
CVE-2026-117548389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schema alias name causes denial of service
26Monitor
CVE-2026-19404389-ds-base: 389-ds-base: missing authorization allows anonymous clients to start or abort cleanallruv replication maintenance
26Monitor

Published before and after this one in the same product

← EarlierCVE-2026-11884Jun 10, 2026 · 389-ds-base: 389-ds-base: heap buffer overflow in schema objectclass serialization due to missing oc_superior in size calculation
26Monitor
← EarlierCVE-2026-16560Jul 22, 2026 · 389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued rdn
21Monitor
← EarlierCVE-2026-18663Aug 12, 2026 · 389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control
23Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
opensuse:389-ds	3.3.1+28b6d8afc-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
suse:389-ds	2.2.11~git12.1e612cde2-150600.8.38.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedOct 1, 2026
Fix recordedOct 30, 2026+28 d
TodayNov 10, 2026+39 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

xclow3n

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Oct 30, 2026, 3:41 AM UTC
SSVC exploitation— → noneOct 2, 2026, 8:07 PM UTC
Exploit maturity— → noneOct 1, 2026, 11:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

access.redhat.com/security/cve/CVE-2026-86344

Show all references (1 more)

bugzilla.redhat.com/show_bug.cgi?id=2529329

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records