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Red Hat Certificate System CVE-2026-12353

| EUVDEUVD-2026-48375 MEDIUM
Missing Release of Resource after Effective Lifetime (CWE-772)
2026-07-23 redhat GHSA-q466-j42v-76wm
Denial Of Service Java Red Hat Certificate System 9 Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat
5.3
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
vuln.today AI
7.5 HIGH

Network-accessible unauthenticated attack with no complexity; availability is H because the Java process crash constitutes complete service loss, not partial degradation.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

2
Analysis Generated
Jul 23, 2026 - 19:49 vuln.today
CVE Published
Jul 23, 2026 - 19:10 cve.org
MEDIUM 5.3

DescriptionCVE.org

An unauthenticated attacker could trigger an Out of Memory condition to crash the Java process for RHCS by repeatedly sending HTTP requests to the TLS endpoint. Depending on how the RHCS server is configured, a manual intervention to restart it may prove necessary.

AnalysisAI

Red Hat Certificate System (RHCS) 9 is susceptible to a resource exhaustion denial-of-service condition triggered by unauthenticated remote attackers flooding its TLS-exposed HTTP endpoint. Repeated requests cause the underlying Java process to exhaust available heap memory, resulting in an Out of Memory crash that takes the certificate authority service offline. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain network access to RHCS TLS port
Delivery
Send high-volume repeated HTTP requests
Exploit
Accumulate unreleased heap allocations
Execution
Exhaust JVM memory
Persist
Crash Java process
Impact
Certificate System unavailable
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Vulnerability AssessmentAI

Exploitation No authentication is required; the CVSS vector confirms PR:N (unauthenticated) and AV:N (network-accessible). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 3.1 score of 5.3 (Medium) reflects a network-reachable, no-authentication, low-complexity attack (AV:N/AC:L/PR:N/UI:N) with partial availability impact (A:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to the RHCS TLS endpoint uses a high-rate HTTP request flood - requiring no credentials or special tooling - to continuously allocate memory in the Java process without triggering adequate garbage collection. After sustaining the flood for a period sufficient to exhaust available heap, the JVM raises an OutOfMemoryError and the RHCS process terminates, rendering the certificate authority unavailable until an operator manually restarts the service.
Remediation No specific patched version number has been confirmed from the available references at time of analysis; consult the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-12353 and Bugzilla entry https://bugzilla.redhat.com/show_bug.cgi?id=2489056 for patch availability and errata details - apply any released update immediately once confirmed. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-12353 vulnerability details – vuln.today
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