High [CVE-2026-53938] Heap buffer overflow in AES Key Wrap decryption leads to denial of service
This high-severity Red Hat Linux advisory covers CVE-2026-53938 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in cjose, a C library for Javascript Object Signing and Encryption (JOSE). A remote, unauthenticated attacker can exploit a heap buffer overflow vulnerability in the AES Key Wrap decryption process.
By submitting a crafted Javascript Web Encryption (JWE) to an application, the attacker can trigger an out-of-bounds heap write. This can corrupt the heap, leading to a denial of service and potentially further memory corruption.
Red Hat severity: Important — CVSS 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H). Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: cjose.
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 2 hours 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 2 hours ago·verify at source
Mitigation checklist
- Applications using `cjose` should be configured to reject JWEs that specify the AES Key Wrap key-management algorithms (`A128KW`, `A192KW`, `A256KW`) when processing untrusted input. This application-layer rejection prevents the vulnerable decryption path from being exercised.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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