CVE-2026-5598 | Legion of the Bouncy Castle BC-JAVA up to 1.83 Private Key covert timing channel

VDB-357694 · CVE-2026-5598 · GCVE-0-2026-5598 LEGION OF THE BOUNCY CASTLE BC-JAVA UP TO 1.83 PRIVATE KEY COVERT TIMING CHANNEL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.6 $0-$5k 3.91+ Summaryinfo A vulnerability categorized as problematic has been discovered in Legion of the Bouncy Castle BC-JAVA up to 1.83. The impacted element is an unknown function of the component Private Key Handler. Executing a manipulation can lead to covert timing channel. The identification of this vulnerability is CVE-2026-5598. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability was found in Legion of the Bouncy Castle BC-JAVA up to 1.83. It has been declared as problematic. This vulnerability affects an unknown functionality of the component Private Key Handler. The manipulation with an unknown input leads to a covert timing channel vulnerability. The CWE definition for the vulnerability is CWE-385. Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information. As an impact it is known to affect confidentiality. CVE summarizes: Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). Non-constant time comparisons risk private key leakage in FrodoKEM. This issue affects BC-JAVA: from 2.17.3 before 1.84. The advisory is available at github.com. This vulnerability was named CVE-2026-5598 since 04/05/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/15/2026). Upgrading to version 1.84 eliminates this vulnerability. Productinfo Type Programming Language Software Vendor Legion of the Bouncy Castle Name BC-JAVA Version 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 1.28 1.29 1.30 1.31 1.32 1.33 1.34 1.35 1.36 1.37 1.38 1.39 1.40 1.41 1.42 1.43 1.44 1.45 1.46 1.47 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 1.56 1.57 1.58 1.59 1.60 1.61 1.62 1.63 1.64 1.65 1.66 1.67 1.68 1.69 1.70 1.71 1.72 1.73 1.74 1.75 1.76 1.77 1.78 1.79 1.80 1.81 1.82 1.83 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 3.7 VulDB Meta Temp Score: 3.6 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Covert timing channel CWE: CWE-385 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: BC-JAVA 1.84 Timelineinfo 04/05/2026 CVE reserved 04/15/2026 +10 days Advisory disclosed 04/15/2026 +0 days VulDB entry created 04/15/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-5598 (🔒) GCVE (CVE): GCVE-0-2026-5598 GCVE (VulDB): GCVE-100-357694 Entryinfo Created: 04/15/2026 11:52 Changes: 04/15/2026 11:52 (68) Complete: 🔍 Cache ID: 99:53F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸