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CVE-2025-48946— liboqs affected by theoretical design flaw in HQC

Quick assessment

Affected
open-quantum-safe liboqs
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.

liboqs是Open Quantum Safe开源的一个用于量子安全加密算法的开源 C 库。 liboqs 0.13.0之前版本存在加密问题漏洞，该漏洞源于HQC算法存在设计缺陷，可能导致大量畸形密文共享相同的隐式拒绝值。

CVSS 3.7 · Low EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1501
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I. Basic Information for CVE-2025-48946

Vulnerability Information
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Vulnerability Title
liboqs affected by theoretical design flaw in HQC
Source: CVE Program / CVE List V5
Vulnerability Description
liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. liboqs prior to version 0.13.0 supports the HQC algorithm, an algorithm with a theoretical design flaw which leads to large numbers of malformed ciphertexts sharing the same implicit rejection value. Currently, no concrete attack on the algorithm is known. However, prospective users of HQC must take extra care when using the algorithm in protocols involving key derivation. In particular, HQC does not provide the same security guarantees as Kyber or ML-KEM. There is currently no patch for the HQC flaw available in liboqs, so HQC is disabled by default in liboqs starting from version 0.13.0. OQS will update its implementation after the HQC team releases an updated algorithm specification.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
liboqs 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
liboqs是Open Quantum Safe开源的一个用于量子安全加密算法的开源 C 库。 liboqs 0.13.0之前版本存在加密问题漏洞，该漏洞源于HQC算法存在设计缺陷，可能导致大量畸形密文共享相同的隐式拒绝值。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-quantum-safe liboqs < 0.13.0 -

II. Public POCs for CVE-2025-48946

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III. Intelligence Information for CVE-2025-48946

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IV. Related Vulnerabilities

Same product: liboqs
Same vendor: open-quantum-safe
Same weakness: CWE-327

V. Comments for CVE-2025-48946

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