CVE-2026-86344
Last modified
CVE-2026-86344 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.
Description
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Directory Server 11 | All versions |
| Red Hat | Red Hat Directory Server 12 | All versions |
| Red Hat | Red Hat Directory Server 13 | All versions |
| Red Hat | Red Hat Enterprise Linux 10 | All versions |
| Red Hat | Red Hat Enterprise Linux 6 | All versions |
| Red Hat | Red Hat Enterprise Linux 7 | All versions |
| Red Hat | Red Hat Enterprise Linux 8 | All versions |
| Red Hat | Red Hat Enterprise Linux 9 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-86344?
How severe is CVE-2026-86344?
How do I fix CVE-2026-86344?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-86334Path traversal in the CLI client image export and copy funct…4.2
- CVE-2026-86335Missing Authorization in imageDownload in Canonical LXD befo…6.3
- CVE-2026-86338Ash field_policies are documented to protect against filter-…6
- CVE-2026-8634Crabbox prior to v0.12.0 contains an environment variable ex…9.3
- CVE-2026-86341GitLab has remediated an issue in GitLab EE affecting all ve…4.4
- CVE-2026-86342Affected versions of MISP contain improper authorization che…4.3
- CVE-2026-86347Affected versions of MISP allow any authenticated user to ac…6.5
- CVE-2026-86348Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 f…4.3
- CVE-2026-86349Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7…4.3
- CVE-2026-8635IBM Langflow OSS 1.0.0 through 1.10.0 allows authenticated u…9.9
- CVE-2026-86350Inconsistent interpretation of HTTP/2 requests ('HTTP Reques…9.1
- CVE-2026-86351Affected versions of MISP validate the user-configurable hom…6.1
Are you affected by CVE-2026-86344?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST