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  4. CVE 2026 47738 liboqs uninitialized function pointer dereference
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-47738

liboqs: Uninitialized function-pointer dereference in OQS_KEM_encaps_derand for NTRU KEMsCVE-2026-47738

Answer in brief

CVE-2026-47738 records a Medium severity (CVSS 5.3) vulnerability in liboqs: Uninitialized function-pointer dereference in OQS_KEM_encaps_derand for NTRU KEMs. The current sources do not mark it as known exploited. The current feed maps open-quantum-safe/liboqs (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps open-quantum-safe/liboqs (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
open-quantum-safe/liboqsgeneric<0.16.00.16.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for open-quantum-safe/liboqs.
  2. 2Review the reported fix. Update open-quantum-safe/liboqs to 0.16.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

liboqs 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • liboqs: Heap out-of-bounds read in LMS/HSS signature verification via unvalidated signature length (hss_verify_inc.c:215)Same open-quantum-safe/liboqs package
  • liboqs: Missing value barrier in FO implicit rejection path (FrodoKEM, NTRU, and others)Same open-quantum-safe/liboqs package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-824
Source
CVE List V5
Source checked
Nov 6, 2026
References
4 linked sources
Open source record