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CVE-2025-52473

17
FAUCET Score

CVE-2025-52473 is a medium-severity vulnerability affecting the liboqs cryptographic library, specifically its HQC key encapsulation mechanism when compiled with Clang at optimization levels above -O0. This flaw introduces secret-dependent branches, allowing a local attacker to recover the entire secret key. While a proof-of-concept exists, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage. Organizations using liboqs should upgrade to version 0.14.0 to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.14.0CPE matchmatch criteria
cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.20%
Probability of exploitation in next 30 days
EPSS Percentile
10.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0020 is in the 48th percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: liboqs

Vendor Advisories (1)

redhatCVE-2025-52473Moderate

liboqs: liboqs secret-dependent branching in HQC

Jul 10, 2025

References

github.com / open-quantum-safe/liboqs/commit/4215362acbf69b88fe1777c4c052f154e29f9897
Patch
github.com / open-quantum-safe/liboqs/security/advisories/GHSA-qq3m-rq9v-jfgm
Vendor Advisory