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  4. CVE 2026 44519 liboqs missing value barrier in fo implicit
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Back to active CVEs
Medium · CVSS 5.1CVE-2026-44519

liboqs: Missing value barrier in FO implicit rejection path (FrodoKEM, NTRU, and others)CVE-2026-44519

Answer in brief

CVE-2026-44519 records a Medium severity (CVSS 5.1) vulnerability in liboqs: Missing value barrier in FO implicit rejection path (FrodoKEM, NTRU, and others). 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 5.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.1. 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, the ct_select function in src/kem/frodokem/external/util.c for the FrodoKEM-640, FrodoKEM-976, and FrodoKEM-1344 AES and SHAKE reference variants lacks a value barrier in the Fujisaki-Okamoto implicit-rejection path. When compiled with Clang 17 or later at an affected optimization level such as -Os, the compiler can emit a secret-dependent conditional load, causing the real and rejection secret paths to leave distinguishable cache residency after successful and failed decapsulation. A local attacker able to perform repeated cache-timing measurements may use this oracle as part of a private-key recovery attack. Default -O3 builds vectorize both source loads and do not exhibit the reported behavior, and the advisory does not report the same generated memory-access pattern in NTRU, NTRU-Prime, BIKE, HQC, Classic McEliece, Kyber, or the already-barriered ML-KEM implementation. 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: Uninitialized function-pointer dereference in OQS_KEM_encaps_derand for NTRU KEMsSame open-quantum-safe/liboqs package

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-385
Source
CVE List V5
Source checked
Nov 6, 2026
References
4 linked sources
Open source record