Out-of-Bounds Write in OpenIDC cjose C Library for JWE Decryption
CVE-2026-53938

8.2HIGH

Key Information:

Vendor

Openidc

Status
Cjose
Vendor
CVE Published:
8 September 2026

What is CVE-2026-53938?

The OpenIDC cjose C library, which implements JavaScript Object Signing and Encryption (JOSE), is susceptible to an Out-of-Bounds Write vulnerability. Prior to version 0.6.2.5, the library's decryption process for the AES Key Wrap key-management algorithms does not properly validate the length of user-supplied encrypted_key. This oversight allows remote, unauthenticated attackers to craft malicious JWE payloads that, upon processing, can lead to heap corruption resulting in potential denial of service or more severe memory corruption issues. It is strongly recommended to upgrade to version 0.6.2.5 or, as an alternative, to reject AES Key Wrap algorithms for untrusted JWEs at the application layer.

Affected Version(s)

cjose < 0.6.2.5

References

https://github.com/OpenIDC/cjose/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/OpenIDC/cjose/commit/8c51d245273583a65...
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.