What is CVE-2026-12353?

CVE-2026-12353 is a medium-severity vulnerability in Red Hat Certificate System 9, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 5.3/10. Published 2026-07-23.

How severe is CVE-2026-12353?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Red Hat Certificate System 9

CVE-2026-12353

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.

Published 2026-07-23 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (36.9th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

access.redhat.com/security/cve/CVE-2026-12353 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-12353?: CVE-2026-12353 is a medium-severity vulnerability in Red Hat Certificate System 9, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 5.3/10. Published 2026-07-23.
How severe is CVE-2026-12353?: Medium severity. CVSS v3 base score is 5.3 out of 10.