CVE-2026-9064VulnerabilityPublished 17 Jun 2026Updated 23 Oct 2026

Red Hat Security Advisory: redhat-ds:12 security update

Affects Red Hat redhat-ds:12Source GCVE Database

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Authoritative record:CVE-2026-9064· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Sources agree

CVSS scores by source
CNA (redhat)	CVSS 3.1	7.5
ADP (redhat-SADP)	CVSS 3.1	7.5

EPSS: 0.8% chance of exploitation in 30 days – higher than 57% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
389-ds-base	Affected =0	Fixed in–
GitHub389-ds-base`pkg:github/389-ds-base`Other threats	Affected =0	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in the updated Red Hat Directory Server 13.2 container image provided by Red Hat. Users should update to this fixed container image by pulling it from the Red Hat container registry. Additionally, network access to LDAP ports (389/tcp and 636/tcp) should be restricted to trusted networks using firewall rules or ACLs to prevent untrusted attackers from reaching the vulnerable code path. Optionally, lowering the nsslapd-maxbersize configuration parameter can reduce the maximum BER message size accepted by the server, partially mitigating the issue, but this does not fully eliminate the amplification and may impact legitimate large LDAP operations.

Description

Red Hat Directory Server is an LDAPv3-compliant directory server. The image is maintained by Red Hat and updated regularly. To pull this container image, run the following command: podman pull registry.redhat.io/dirsrv/dirsrv-container-rhel10:13.2

Impact

A remote unauthenticated attacker with network access to the LDAP port can cause denial of service by sending a single crafted LDAP request with an excessive number of controls. This leads to unbounded memory allocations and high CPU consumption, resulting in latency degradation, worker thread starvation, or server termination due to out-of-memory conditions. The impact is availability loss of the directory service. There is no impact on confidentiality or integrity.

Summary

CVE-2026-9064 is a resource exhaustion vulnerability in the get_ldapmessage_controls_ext() function of the 389-ds-base LDAP server used in Red Hat Directory Server. The function does not enforce an upper bound on the number of controls per LDAP message. An attacker can send a crafted LDAP request containing hundreds of thousands of minimal controls within the default 2 MB BER message size, causing excessive CPU usage and heap allocations. Concurrent exploitation can degrade service availability by causing latency, worker thread starvation, or out-of-memory termination, resulting in denial of service. The vulnerability affects Red Hat Directory Server versions 12.2 prior to 12.2.7-15 and 13.2. Mitigations include network access restrictions to LDAP ports and lowering the nsslapd-maxbersize parameter, though only the patch that enforces a maximum controls-per-message limit fully resolves the issue. Red Hat has released an updated container image for version 13.2 containing the fix.

CWE-770Allocation of Resources Without Limits or Throttling (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #25
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Requirements
Clearly specify the minimum and maximum expectations for capabilities, and dictate which behaviors are acceptable when resource allocation reaches limits.
Architecture and Design
Limit the amount of resources that are accessible to unprivileged users. Set per-user limits for resources. Allow the system administrator to define these limits. Be careful to avoid CWE-410.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V8.1.4 (opens in a new tab)
V13.4.1 (opens in a new tab)
V11.1.4 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Exponential Data Expansion (opens in a new tab)
Serialized Data Parameter Blowup (opens in a new tab)
Serialized Data with Nested Payloads (opens in a new tab)
Oversized Serialized Data Payloads (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Aug 2026, 18:22 UTC

WeaknessesCWE-770

Technical details

References

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