liboqs: Uninitialized function-pointer dereference in OQS_KEM_encaps_derand for NTRU KEMs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-47738
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-06 22:17:51 UTC
Updated2026-11-06 22:17:51 UTC
Descriptionliboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Prior to 0.16.0, OQS_KEM_encaps_derand can dereference an uninitialized encaps_derand function pointer when called on NTRU-HPS-2048-509, NTRU-HPS-2048-677, NTRU-HPS-4096-821, NTRU-HPS-4096-1229, NTRU-HRSS-701, or NTRU-HRSS-1373. The affected NTRU constructors omit the OQS_KEM.encaps_derand member because those schemes do not support derandomized encapsulation, OQS_KEM objects are allocated without zero initialization, and the wrapper in src/kem/kem.c checks only that the OQS_KEM pointer is non-null before calling through the residual heap value. An application is affected only if it instantiates one of those six NTRU KEMs and invokes OQS_KEM_encaps_derand on it. The supported impact is a calling-process crash and denial of service. This issue is fixed in version 0.16.0.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

EPSS: 0.003010000 probability, percentile 0.230230000 (date 2026-11-08)

Problem Types: CWE-824 | CWE-824 CWE-824: Access of Uninitialized Pointer

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-quantum-safe Liboqs affected < 0.16.0 Not specified

References

ReferenceSourceLinkTags
github.com/open-quantum-safe/liboqs/pull/2460 [email protected] github.com
github.com/open-quantum-safe/liboqs/security/advisories/GHSA-jr5q-r9qx-v738 [email protected] github.com
github.com/open-quantum-safe/liboqs/commit/80ceff0207658eba98bae8eb22ca3... [email protected] github.com
github.com/open-quantum-safe/liboqs/releases/tag/0.16.0 [email protected] github.com
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