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CVE-2026-12353— Rhcs: memory leak during https connection leads to denial of service

Quick assessment

Affected
Red Hat Red Hat Certificate System 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat Certificate System是美国Red Hat公司的一套数字证书管理系统。 Red Hat Certificate System存在资源管理错误漏洞，该漏洞源于未验证的攻击者重复向TLS端点发送HTTP请求触发内存不足条件，可能导致Java进程崩溃。

CVSS 5.3 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat Certificate System 9 any affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-12353

Vulnerability Information
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Vulnerability Title
Rhcs: memory leak during https connection leads to denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Certificate System 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Certificate System是美国Red Hat公司的一套数字证书管理系统。 Red Hat Certificate System存在资源管理错误漏洞，该漏洞源于未验证的攻击者重复向TLS端点发送HTTP请求触发内存不足条件，可能导致Java进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Certificate System 9 - cpe:/a:redhat:certificate_system:9
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-12353

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III. Intelligence Information for CVE-2026-12353

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Vendor Advisories for CVE-2026-12353 (2)

Same Patch Batch · Red Hat · 2026-07-23 · 4 CVEs total

CVE-2026-16745 8.8 HIGH Odh-dashboard: odh-dashboard: backend port 8080 trusts x-forwarded-access-token without or
CVE-2026-64611 7.5 HIGH Libcupsfilters: cups-filters: libcupsfilters: cpu exhaustion via infinite loop in cfieee12
CVE-2026-6390 6.8 MEDIUM Nano: gnu nano: arbitrary memory writes, information disclosure, or denial of service via

IV. Related Vulnerabilities

Same product: Red Hat Certificate System 9
Same vendor: Red Hat
Same weakness: CWE-772

V. Comments for CVE-2026-12353

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