High [CVE-2026-63072] heap buffer overflow in CMS key unwrapping
This high-severity Red Hat Linux advisory covers CVE-2026-63072 affecting Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7.
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Summary
A flaw was found in OpenSSL. A crafted CMS (Cryptographic Message Syntax) message can cause an 8-byte out-of-bounds heap write when it is decrypted with CMS_decrypt().
This issue occurs because the CMS decryption process incorrectly sizes the key-unwrap output buffer when using the AES-WRAP-PAD unwrap primitive. This can lead to memory corruption, resulting in a denial of service.
To exploit this flaw, an attacker needs to supply a crafted CMS message to be decrypted in an application by CMS_decrypt(). The out-of-bounds write is a fixed-size (8-byte), fixed-value (zero) heap overflow immediately past the memory allocation, causing memory corruption, but the impact is limited to a denial of service.
For these reasons, this flaw has been rated with a moderate severity. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Developer Hub; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; 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; Red Hat package: ovmf; Red Hat package: compat-openssl11.
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 1 hour 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 1 hour 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 1 hour ago·verify at source
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