Secret Key Exposure in liboqs Cryptographic Library by Open Quantum Safe
CVE-2025-52473

5.9MEDIUM

Key Information:

Vendor

Open-quantum-safe

Status
Liboqs
Vendor
CVE Published:
10 July 2025

What is CVE-2025-52473?

The liboqs cryptographic library, developed by Open Quantum Safe, contains a vulnerability that arises from multiple secret-dependent branches within the reference implementation of the HQC key encapsulation mechanism. When the library is compiled with Clang at optimization levels higher than -O0, these branches can inadvertently leak secret key information. An attacker could exploit this flaw through a proof-of-concept local attack to recover the entire secret key, posing a significant security risk. Users are advised to update to version 0.14.0 or later, where this vulnerability has been addressed.

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Affected Version(s)

liboqs < 0.14.0

References

https://github.com/open-quantum-safe/liboqs/security/advi...
x_refsource_CONFIRM
https://github.com/open-quantum-safe/liboqs/commit/421536...
x_refsource_MISC

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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