CVE-2026-11873Network attack vector

Stack-trace disclosure and log exhaustion via malformed requests

Published Sep 1, 2026 · Updated Sep 1, 2026

Improper error handling in Red Hat Certificate System and RHEL allows remote attackers to disclose stack traces and amplify CA logs. POST /ca/rest/certrequests processes unauthenticated malformed input through an exception path that returns HTTP 500 and writes multiline Java traces. Repeated requests require no authentication and create gradual disk growth and I/O contention, without code execution or a direct service crash.

CVSS severity6.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper error handling in Red Hat Certificate System and RHEL allows remote attackers to disclose stack traces and amplify CA logs. POST /ca/rest/certrequests processes unauthenticated malformed input through an exception path that returns HTTP 500 and writes multiline Java traces. Repeated requests require no authentication and create gradual disk growth and I/O contention, without code execution or a direct service crash.

The record

CVE
CVE-2026-11873
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
389 Directory Server
Product
Red Hat Certificate System
Classifications
CWE-209, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Certificate SystemAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

6.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
T1499.003Endpoint Denial of Service: Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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