High [CVE-2026-63074] CMP indefinite cache growth of ExtraCerts
This high-severity Red Hat Linux advisory covers CVE-2026-63074 affecting Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in OpenSSL. The CMP (Certificate Management Protocol) implementation does not clear cached additional certificates when an invalid message is received, leading to excessive memory consumption.
This allows a malicious client to repeatedly send requests containing unique extra certificates to cause memory exhaustion, eventually resulting in a denial of service. To exploit this flaw, an attacker needs to repeatedly send invalid messages containing additional certificates to a CMP server.
However, this issue only affects CMP servers with long-lived context objects. This can grow the extra certificates cache and cause excessive memory consumption, eventually resulting in a denial of service.
For these reasons, this vulnerability has been rated with a low severity. Red Hat severity: Low — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Affected Red Hat products: Red Hat Developer Hub; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4; Red Hat Satellite 6; Red Hat Satellite Client.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: edk2; Red Hat package: openssl.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
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