PT-2026-65408 · Legion Of The Bouncy Castle · Bc-Java

CVE-2024-14041 · Published 2026-07-28 · Updated 2026-07-28

NVD

CVSS v4.0

8.2

High

Base vector

AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber

In Bouncy Castle for Java from 1.73 to before 1.78, three ML-KEM (CRYSTALS-Kyber) routines divided secret-derived polynomial coefficients by the modulus q: Poly.toMsg, which decodes the decrypted message, and the ciphertext compression routines Poly.compressPoly and PolyVec.compressPolyVec. An attacker able to measure the timing of a large number of decapsulations performed with the same long-term private key can recover that key. These are the KyberSlash1 (Poly.toMsg) and KyberSlash2 (ciphertext compression) divisions. Compression performed during encapsulation operates on values that become the public ciphertext and is not affected.

Exploit

Fix

Weakness Enumeration

CWE-208

Related Identifiers

CVE-2024-14041

Affected Products

Bc-Java

References · 5

• 🔥 https://github.com/bcgit/bc-java/wiki/CVE-2024-14041 · Exploit
• https://github.com/bcgit/bc-java/commit/1590247178f2280defa36421475f015175dfbe9e · Patch
• https://github.com/bcgit/bc-java/commit/5adb2c5c5b462a332b01a012bea0784b40b904e5 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2024-14041 · Security Note
• https://kyberslash.cr.yp.to · Note