Heap-based buffer overflow in cjose - #VU133239
Published: June 2, 2026
Vulnerability identifier: #VU133239
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
cjose
cjose
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in _cjose_jwe_decrypt_ek_aes_kw() in src/jwe.c when decrypting a crafted JWE using the AES Key Wrap algorithms. A remote attacker can submit a specially crafted JWE with an oversized encrypted_key value to cause a denial of service.
Only deployments that decrypt JWEs with A128KW, A192KW, or A256KW are affected.
Remediation
Install security update from vendor's website.