Description
An Apache-proxied Dogtag CA REST endpoint exposed by IdM (POST /ca/rest/certrequests) returns HTTP 500 with internal Java stack traces for unauthenticated malformed requests. The same unauthenticated error path emits large multi-line stack traces into the CA debug log, creating a log-amplification resource exhaustion vector (disk growth and I/O contention) without requiring authentication.
Published: 2026-09-01
Score: 6.5 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability occurs when an unauthenticated empty request is sent to the Dogtag CA REST endpoint /ca/rest/certrequests. The server responds with a 500 error and sends a full Java stack trace in the HTTP response, exposing internal implementation details. In addition, the exception is logged to the CA debug log, producing large multi-line traces that can quickly consume disk space and I/O resources, leading to a denial-of-service via log amplification. This results in information disclosure (sensitive data in stack traces) and potential resource exhaustion.

Affected Systems

The affected products are Red Hat Certificate System 9 and several Red Hat Enterprise Linux releases: 6, 7, 8, 9, and 10, as mentioned by the CNA. The specific endpoint is part of the dogtag‑pki component exposed by Red Hat IdM.

Risk and Exploitability

The CVSS score is 6.5, indicating moderate severity. The EPSS score is not available, and the vulnerability is not listed in KEV, suggesting no known widespread exploitation. The attack vector is likely networkable through the exposed REST API; an unauthenticated client can trigger the error by sending an empty POST request, so protection relies on the API failing safely. Although no formal patch is announced yet, the CNA proposes a workaround that moves authentication checks earlier, returns simple 4xx errors, and rate-limits stack‑trace logging.

Generated by OpenCVE AI on September 1, 2026 at 13:44 UTC.

Remediation

Vendor Workaround

Make the CA REST API fail safely by checking authentication early and returning simple 4xx errors for malformed requests without stack traces, and tune exception handling and logging so attacker-controlled input cannot spam large stack-trace logs (rate-limit/truncate).


OpenCVE Recommended Actions

  • Apply Red Hat patch for CVE‑2026‑11873 when released.
  • Implement the CNA‑recommended workaround: validate authentication early, return a 4xx error for malformed requests, and configure logging to suppress or rate‑limit stack traces.
  • Monitor CA debug log size and disk usage regularly, and enforce log rotation or truncation to prevent resource exhaustion.
  • Restrict unauthenticated access to the /ca/rest/certrequests endpoint via firewall or access control policies.

Generated by OpenCVE AI on September 1, 2026 at 13:44 UTC.

Tracking

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Advisories

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History

Tue, 01 Sep 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat certificate System
CPEs cpe:/a:redhat:certificate_system:9
Vendors & Products Redhat certificate System

Tue, 01 Sep 2026 12:00:00 +0000

Type Values Removed Values Added
Description An Apache-proxied Dogtag CA REST endpoint exposed by IdM (POST /ca/rest/certrequests) returns HTTP 500 with internal Java stack traces for unauthenticated malformed requests. The same unauthenticated error path emits large multi-line stack traces into the CA debug log, creating a log-amplification resource exhaustion vector (disk growth and I/O contention) without requiring authentication.
Title Pki-core: dogtag-pki: empty request to dogtag /ca/rest/certrequests causes http 500, java exception, and stacktrace disclosure
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-209
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}


Subscriptions

Redhat Certificate System Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-01T12:47:10.419Z

Reserved: 2026-06-10T12:24:05.399Z

Link: CVE-2026-11873

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T12:17:35.300

Modified: 2026-09-01T13:18:07.957

Link: CVE-2026-11873

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T13:45:05Z

Weaknesses
  • CWE-209

    Generation of Error Message Containing Sensitive Information