CVE-2024-14041 | In Bouncy Castle for Java from 1.73 to before 1.78, three ML… | CVSS 8.2 HIGH

Description

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.

Metadata

CVE ID: CVE-2024-14041
State: PUBLISHED
Assigner: bcorg
Reserved: 2026-07-28 05:07 UTC
Published: 2026-07-28 08:05 UTC
Last updated: 2026-07-28 12:55 UTC
Primary CWE: CWE-208
CWE-208 Observable Timing Discrepancy
Vendor / Product: Legion of the Bouncy Castle Inc. / BC-JAVA
Sources: cve.org · NVD

Severity & Metrics

8.2 HIGH CVSS 4.0

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Legion of the Bouncy Castle Inc.	BC-JAVA	all	1.73 < 1.78

Weakness (CWE)

CWE	Source	Description
CWE-208	cna	CWE-208 Observable Timing Discrepancy

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.2	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber

References (4)