TI-2024-24191 Aliases CVE-2024-36405

Control-flow timing leak in Kyber reference implementation when compiled with Clang 15-18 for -Os, -O1 and other options

LOW 33CWE-208Published 2024-06-10 · Updated 2024-08-02

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: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-208.

Summary

liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. A control-flow timing lean has been identified in the reference implementation of the Kyber key encapsulation mechanism when it is compiled with Clang 15-18 for `-Os`, `-O1`, and other compilation options. A proof-of-concept local attack on the reference implementation leaks the entire ML-KEM 512 secret key in ~10 minutes using end-to-end decapsulation timing measurements. The issue has been fixed in version 0.10.1. As a possible workaround, some compiler options may produce vectorized code that does not leak secret information, however relying on these compiler options as a workaround may not be reliable.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00515 44th percentileScored 2026-11-07

Fix Partial liboqs (open-quantum-safe): 0.10.1Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
open-quantum-safe	liboqs	before 0.10.1	0.10.1	Patch available	CNA

liboqs Vendoropen-quantum-safe Affected before 0.10.1 Fixed in 0.10.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openquantumsafe:liboqs::::::::	before 0.10.1	Vulnerable	open-quantum-safe

cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:* Versions before 0.10.1 Vulnerable ·open-quantum-safe

Remediation

Fix · CNA liboqs (open-quantum-safe) Fixed in 0.10.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet

Timeline

2026-10-02 Threatist record created from CVE-2024-36405

References

Patch 3

Other 1

https://github.com/open-quantum-safe/liboqs/blob/7eecda6095c003ddded7175a1ffdf35a2ce63ed5/src/kem/kyber/pqcrystals-kyber_kyber512_ref/poly.c#L166

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-2024-36253 liboqs has a correctness error in HQC decapsulation 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