HQC

Hamming Quasi-Cyclic HQC HQC is a code-based Key Encapsulation Mechanism KEM selected by NIST during the NIST's Post-Quantum Cryptography Standardization Project. This repository contains the implementation provided by the HQC team. Structure The project is organized into modular components,...

CVE-2026-18040

A flaw was found in Bouncy Castle. The Hamming Quasi-Cyclic HQC cryptographic algorithm leaks secret data through memory cache access patterns and execution timing variations during key encapsulation and decapsulation operations. A local attacker capable of monitoring cache activity or measuring...

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...

Accelerating HQC for Post-Quantum TLS 1.3 on X86 IoT Gateways

Post-quantum TLS at an IoT gateway must protect many device connections without large increases in handshake delay, CPU cost, or network traffic. HQC provides code-based diversity beyond ML-KEM, but its computation and ciphertext sizes can increase these costs. We optimize HQC for x86 processors...

SUSE 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...

Timing Attack

Overview org.bouncycastle:bcprov-jdk14 is a Java implementation of cryptographic algorithms. Affected versions of this package are vulnerable to Timing Attack through the GF arithmetic and the fixed-weight support sampler in HQCEngine. An attacker can recover information about the HQC private key...

Timing Attack

Overview Affected versions of this package are vulnerable to Timing Attack through the GF arithmetic and the fixed-weight support sampler in HQCEngine. An attacker can recover information about the HQC private key by observing cache behavior or decapsulation timing while the code processes secret...

Timing Attack

Overview Affected versions of this package are vulnerable to Timing Attack through the GF arithmetic and the fixed-weight support sampler in HQCEngine. An attacker can recover information about the HQC private key by observing cache behavior or decapsulation timing while the code processes secret...

Timing Attack

Overview Affected versions of this package are vulnerable to Timing Attack through the GF arithmetic and the fixed-weight support sampler in HQCEngine. An attacker can recover information about the HQC private key by observing cache behavior or decapsulation timing while the code processes secret...

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

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

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 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...