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CVE-2026-53938— OpenIDC/cjose has a heap buffer overflow in AES Key Wrap decryption (A128KW/A192KW/A256KW)

Quick assessment

Affected
OpenIDC cjose
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenIDC/cjose 是一个实现了 JavaScript 对象签名和加密（JOSE）标准的 C 语言库。在 0.6.2.5 版本之前，cjose 在处理 AES 密钥包裹（Key Wrap）密钥管理算法（ 值为 、 、 ）的 JWE 解密路径中，在将攻击者提供的 （JWE 加密密钥）解包到固定大小的堆分配的内容加密密钥（CEK）缓冲区之前，未对其长度进行校验。 一个能够向应用提交精心构造的 JWE 的远程未认证攻击者，可以触发一次堆内存越界写，从而导致堆内存损坏。这至少会导致程序崩溃（服务拒绝），并且根据具体

CVSS 8.2 · High EPSS 0.07% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-53938

Vulnerability Information
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Vulnerability Title
OpenIDC/cjose has a heap buffer overflow in AES Key Wrap decryption (A128KW/A192KW/A256KW)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenIDC cjose < 0.6.2.5 -

II. Public POCs for CVE-2026-53938

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III. Intelligence Information for CVE-2026-53938

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Patches & Fixes for CVE-2026-53938 (1)

Vendor Advisories for CVE-2026-53938 (1)

IV. Related Vulnerabilities

Same product: cjose
Same vendor: OpenIDC
Same weakness: CWE-122

V. Comments for CVE-2026-53938

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