SB2026091601 - Debian update for cjose

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Main Vulnerability Database SB2026091601

SB2026091601 - Debian update for cjose

Published: September 16, 2026

Security Bulletin ID SB2026091601
CSH Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-53938)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.8 [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]


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.


2) Use of Hard-coded Cryptographic Key (CVE-ID: CVE-2026-53939)

CWE-ID: CWE-321 - Use of Hard-coded Cryptographic Key

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose plaintext and modify protected content.

The vulnerability exists due to use of a hard-coded cryptographic key in JWE encryption in src/jwe.c when encrypting a JWE with an AES-CBC-HMAC content-encryption algorithm together with a key-management algorithm that generates a fresh CEK. A remote attacker can obtain a produced JWE and decrypt or forge its contents to disclose plaintext and modify protected content.

This affects only JWEs produced by the vulnerable encryption path; the issue does not affect the decryption path.


Remediation

Install update from vendor's website.

References