Heap-based Buffer Overflow Affecting cjose package, versions <0:0.6.1-5.module+el8.10.0+91060+e975931f


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.24% (14th percentile)

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  • Snyk IDSNYK-ORACLE8-CJOSE-20885720
  • published13 Oct 2026
  • disclosed9 Sept 2026

Introduced: 9 Sep 2026

CVE-2026-53938  (opens in a new tab)
CWE-122  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Oracle:8 cjose to version 0:0.6.1-5.module+el8.10.0+91060+e975931f or higher.
This issue was patched in ELSA-2026-77369.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cjose package and not the cjose package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). Prior to version 0.6.2.5, cjose's JWE decryption path for the AES Key Wrap key-management algorithms (alg = A128KW, A192KW, A256KW) does not validate the length of the attacker-supplied encrypted_key (JWE Encrypted Key) before unwrapping it into a fixed-size, heap-allocated Content Encryption Key (CEK) buffer. A remote, unauthenticated attacker who can submit a crafted JWE to an application that decrypts it with an AES-KW symmetric key can trigger an out-of-bounds heap write, corrupting the heap. This leads at minimum to a crash (denial of service) and, depending on the heap layout and allocator, may be leverageable for further memory-corruption impact. cjose_jwe_import() / cjose_jwe_decrypt() are pre-authentication entry points: they parse and process fully attacker-controlled input. Upgrade to cjose 0.6.2.5 to receive a patch. If upgrading is not immediately possible, reject the AES Key Wrap algorithms (A128KW/A192KW/A256KW) for untrusted JWEs at the application layer.

CVSS Base Scores

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