HQC

Hamming Quasi-Cyclic HQC This repository provides the official implementation ofHQC, a code-based Key Encapsulation Mechanism KEM whose security is based on the hardness of solving the Quasi-Cylic Syndrome Decoding QCSD problem. HQC is one of the selected algorithms from the NIST's Post-Quantum...

hqc-x86-simd

Optimized HQC Implementations for AVX2 and AVX-512 This repository contains the optimized HQC implementations and benchmarking code accompanying the paper "Accelerating HQC for Post-Quantum TLS 1.3 on x86 IoT Gateways". It is a fork of the official HQC repository, extended with AVX-512 + GFNI...

CVE-2026-18040

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

DEBIAN-CVE-2026-18040

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

CVE-2026-18040

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

UBUNTU-CVE-2026-18040

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

CVE-2026-18040 HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

CVE-2026-18040 HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

CVE-2026-18040

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

CVE-2026-18040

Bouncy Castle for Java versions before 1.86 are vulnerable to the leakage of secret-derived data within the HQC implementation. The root cause involves two side channels: GF(2^8) arithmetic utilizing lookup tables indexed by field elements (making touched cache lines a function of the operand), a...

CVE-2026-18040 HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

EUVD-2026-92004

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

CVE-2026-18040: Observable Timing Discrepancy

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

Linux Distros Unpatched Vulnerability : CVE-2026-18040

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field...

PT-2026-104566

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description HQC leaks secret-derived data through two side channels during encapsulation and decapsulation. The GF2^8 arithmetic uses lookup tables indexed by field elements, causing the touched...

OT-PCA: New Key-Recovery Plaintext-Checking Oracle Based Side-Channel Attacks on HQC with Offline Templates

In this paper, we introduce OT-PCA, a novel approach for conducting Plaintext-Checking PC oracle based side-channel attacks, specifically designed for Hamming Quasi-Cyclic HQC. By calling the publicly accessible HQC decoder, we build offline templates that enable efficient extraction of soft...

Security update for liboqs, oqs-provider

This update for liboqs, oqs-provider fixes the following issues: disable KEMHQC and SIGMQOM and KEMNTRUPRIME on s390x for now, testsuite shows them not working. Updated to 0.16.0: Deprecation notice: SPHINCS+ was removed in 0.16.0. Security issues: Fixed uninitialized encapsderand pointer...

SUSE-SU-2026:3420-1 Security update for liboqs, oqs-provider

This update for liboqs, oqs-provider fixes the following issues: - disable KEMHQC and SIGMQOM and KEMNTRUPRIME on s390x for now, testsuite shows them not working. Updated to 0.16.0: Deprecation notice: - SPHINCS+ was removed in 0.16.0. Security issues: - Fixed uninitialized encapsderand pointer...

crypt_guard (0.1.4), env_encryption_tool (0.9.17) +8 more potentially affected by unknown CVE via pqcrypto-hqc (>=0.0.4, <=0.2.2)

pqcrypto-hqc CARGO version =0.0.4, =0.12.2, =0.1.0, =0.1.0, =0.2.0, =0.2.1, =0.5.1 Source cves: unknown CVE Source advisory: OSV:RUSTSEC-2026-0168...

`pqcrypto-hqc` is unmaintained: upstream PQClean project being archived

This crate provides Rust bindings to the HQC key encapsulation mechanism via C implementations from PQClean. The PQClean project is being archived in or after July 2026 see PQClean/PQClean604, after which no further security patches or bug fixes will be applied to the upstream implementations. As...