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TI-2024-36253 Aliases CVE-2024-54137

liboqs has a correctness error in HQC decapsulation

Priority LOW 35CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-200.

Summary

liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. A correctness error has been identified in the reference implementation of the HQC key encapsulation mechanism. Due to an indexing error, part of the secret key is incorrectly treated as non-secret data. This results in an incorrect shared secret value being returned when the decapsulation function is called with a malformed ciphertext. This vulnerability is fixed in 0.12.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00403 34th percentileScored 2026-11-07
Fix Fixed liboqs (open-quantum-safe): 0.12.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
open-quantum-safeliboqsbefore 0.12.00.12.0Patch availableCNA
  • liboqs Vendoropen-quantum-safe Affected before 0.12.0 Fixed in 0.12.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:*before 0.12.0Vulnerableopen-quantum-safe
  • cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:* Versions before 0.12.0 Vulnerable ·open-quantum-safe

Remediation

  • Fix · CNA liboqs (open-quantum-safe) Fixed in 0.12.0

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-54137

References

Patch 2

  • TI-2024-20867 An issue in Open Quantum Safe liboqs v.10.0 allows a remote attacker to escalate… CVSS 3.1CRITICAL 9.8
  • TI-2024-24191 Control-flow timing leak in Kyber reference implementation when compiled with Clang 15-18 for -Os, -O1 and other options CVSS 3.1HIGH 7.5
  • TI-2026-34064 liboqs: Heap-buffer-overflow in XMSS verification path via OID-controlled parameter mismatch (xmss_commons.c:194) CVSS 3.1MEDIUM 5.3
  • TI-2026-32448 liboqs: XMSS Buffer Overread Bug CVSS 3.1MEDIUM 5.3
  • TI-2025-32600 liboqs secret-dependent branching in HQC reference implementation when compiled with Clang 17-20 CVSS 3.1MEDIUM 5.9
  • TI-2025-31084 liboqs affected by theoretical design flaw in HQC CVSS 3.1LOW 3.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences